PVR/SGX: first fixes applied

rcn-ee, tweaked from http://git.goldelico.com/?p=gta04-kernel.git;a=commit;h=28f14d2bfdda38b5158c34aacf34b3c6c54332d9

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Robert Nelson <robertcnelson@gmail.com>