This adds entry for new DRM driver from xilinx called "xlnx" which supports atomic modesetting. We have kept entry for older DRM driver "xilinx_drm" for backward compatility with a note describing deprecation. Signed-off-by: Devarsh Thakkar <devarsht@xilinx.com> https://bugzilla.gnome.org/show_bug.cgi?id=795228