xfree86: drivers: fbdev: copy over xf86-video-fbdev tree

Since this driver doesn't receive much functional changes, except fixups
for server ABI changes, it's a good candidate to move it back into the
main Xserver tree.

As the first step to move back this driver into the Xserver tree,
copy over the source from last release tag. Skipped files we don't need
here (eg. gitlab pipeline, automake files, ...)

repo: git@github.com:X11Libre/xf86-video-fbdev.git
git tag: xlibre-xf86-video-fbdev-0.5.1.1

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

hw/xfree86/drivers/video/fbdev/COPYING

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+Copyright (C) 1994-2003 The XFree86 Project, Inc.  All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is fur-
+nished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
+NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
+NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of the XFree86 Project shall not
+be used in advertising or otherwise to promote the sale, use or other deal-
+ings in this Software without prior written authorization from the XFree86
+Project.

hw/xfree86/drivers/video/fbdev/README.md

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+xf86-video-fbdev - video driver for framebuffer device
+------------------------------------------------------
+
+All questions regarding this software should be directed at the
+Xorg mailing list:
+
+  https://lists.x.org/mailman/listinfo/xorg
+
+The primary development code repository can be found at:
+
+  https://gitlab.freedesktop.org/xorg/driver/xf86-video-fbdev
+
+Please submit bug reports and requests to merge patches there.
+
+For patch submission instructions, see:
+
+  https://www.x.org/wiki/Development/Documentation/SubmittingPatches
+

hw/xfree86/drivers/video/fbdev/man/fbdev.man

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+.\" shorthand for double quote that works everywhere.
+.ds q \N'34'
+.TH FBDEV __drivermansuffix__ __vendorversion__
+.SH NAME
+fbdev \- video driver for framebuffer device
+.SH SYNOPSIS
+.nf
+.B "Section \*qDevice\*q"
+.BI "  Identifier \*q"  devname \*q
+.B  "  Driver \*qfbdev\*q"
+.BI "  BusID  \*qpci:" bus : dev : func \*q
+\ \ ...
+.B EndSection
+.fi
+.SH DESCRIPTION
+.B fbdev
+is an
+.B __xservername__
+driver for framebuffer devices.
+This is a non-accelerated driver,
+the following framebuffer depths are supported: 8, 15, 16, 24.
+All visual types are supported for depth 8,
+and TrueColor visual is supported for the other depths.
+Multi-head configurations are supported.
+.SH SUPPORTED HARDWARE
+The
+.B fbdev
+driver supports all hardware where a framebuffer driver is available.
+fbdev uses the os-specific submodule
+.BR fbdevhw (__drivermansuffix__)
+to talk to the kernel device driver.
+Currently a fbdevhw module is available for Linux.
+.SH CONFIGURATION DETAILS
+Please refer to
+.BR __xconfigfile__ (__filemansuffix__)
+for general configuration details.
+This section only covers configuration details specific to this driver.
+.PP
+For this driver it is not required to specify modes
+in the screen section of the config file.
+The
+.B fbdev
+driver can pick up the currently used video mode from the framebuffer
+driver and will use it if there are no video modes configured.
+.PP
+For PCI boards you might have to add a BusID line to the Device section.
+See above for a sample line.
+.PP
+The following driver
+.B Options
+are supported:
+.TP
+.BI "Option \*qfbdev\*q \*q" string \*q
+The framebuffer device to use.
+Default: /dev/fb0.
+.TP
+.BI "Option \*qShadowFB\*q \*q" boolean \*q
+Enable or disable use of the shadow framebuffer layer.
+Mandatory for 24bpp framebuffers on newer servers.
+Default: on.
+.TP
+.BI "Option \*qRotate\*q \*q" string \*q
+Enable rotation of the display.
+The supported values are "CW" (clockwise, 90 degrees),
+"UD" (upside down, 180 degrees)
+and "CCW" (counter clockwise, 270 degrees).
+Implies use of the shadow framebuffer layer.
+Disabled for 24bpp framebuffers.
+Default: off.
+.SH "SEE ALSO"
+.BR __xservername__ (__appmansuffix__),
+.BR __xconfigfile__ (__filemansuffix__),
+.BR Xserver (__appmansuffix__),
+.BR X (__miscmansuffix__),
+.BR fbdevhw (__drivermansuffix__)
+.SH AUTHORS
+Authors include: Gerd Knorr, Michel D\(:anzer, Geert Uytterhoeven