package/libva-intel-driver: Do not depend on xorg

This patch reverts
http://git.buildroot.net/buildroot/commit/package/libva-intel-driver/Config.in?id=062bacfa67688b2747412a30ddeb996449d1c6df



By removing the xorg dependency of libpciaccess the libdrm package, and
therefore also libva-intel-driver, does not depend on xorg any longer.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>