drm/gma500: Remove unused ioctls

All of these ioctls are unused and most of them just duplicate what drm
already provides.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

diff --cc drivers/gpu/drm/gma500/gem.c
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_drv.c
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_intel_display.c
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_intel_drv.h
Simple merge

diff --cc include/drm/gma_drm.h
Simple merge