Adding required ST-Ericsson changes to graphics.h (by freexperia)

Pixel formats have been added to graphics.h (they used to be in
hardware.h). One is ST-Ericsson specific and the rest are just
added since they were there in GB.

https://github.com/TeamCanjica/android_system_core/commit/fec9757566b3bdcffeef03efd8de36c4c0e5f704