Update audio.h for ste_audio hardware

Change-Id: I8cc54165ffea591d6d574359e03be2c7dcbd4c96
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