Adding required ST-Ericsson changes to graphics.h

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.

Change-Id: I383e25ecc8faa89678642bbea65fd7b12ba9ca32
rootdir: Add support for checking for libs under ste_omxcomponents

Change-Id: If29bd544e5ad34c2a9c0123912bd21b4495ecf8f