graphics: Bring back old pixel formats

Needed for exynos4 graphics modules

Change-Id: Ib10f4e5543861df32fbd3589643e919e15ddc834
init: Implement exec support

Code copied from CM7 implementation by Steve Kondik

Change-Id: Ie8f11e9dc9e552aa7a4fe354995daaf8f0d99a11