xorg-server: update to xorg-server-1.6.0

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/Generic: dont build XHCI driver as module, and dont unload on suspend (for testing, please revert if this still causes problems with suspend/wakeup)

Signed-off-by: Stephan Raue <stephan@openelec.tv>