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Because a wide range of embedded ARM devices are actually supported
(Allwinner A1X/A20, Raspberry Pi, ODROID-X, Rockchip, ...) and
are getting some sort of performance improvement and/or hardware
acceleration, the DDX driver needs a vendor neutral name.

Resolves https://github.com/ssvb/xf86-video-fbturbo/issues/10

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

When enabled, it tries to avoid tearing in OpenGL ES applications.
Works on sunxi hardware in the case if the hardware overlay (sunxi
disp layer) is used for a DRI2 window. The name of this option and
the description in the man page has been borrowed from intel and
radeon drivers.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

The installation instructions from http://linux-sunxi.org/Binary_drivers wiki
page currently ask the users to run the following command after compiling
and installing the ddx driver (either xf86-video-mali or xf86-video-sunxifb):

    cp xorg.conf /usr/share/X11/xorg.conf.d/99-mali400.conf

Regardless of whether it is a good idea to touch /usr/share/X11/xorg.conf.d
directory in the first place, providing a sample xorg.conf file may save
some users from having unnecessary troubles.

Reported-by: Michal Suchanek via https://github.com/ssvb/xf86-video-sunxifb/pull/1

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>