GPU: update genlock to jb-chocolote

For use with new display and media repos

Change-Id: Ibf0eb4f9dbdfa37081af24b9e1fd3accc3ffce4e
Defer sweep2wake changes till screen is resumed.
Idea taken from some Atmel implementation tho I've lost URI there :(
Always enable IRQ when resuming display.
This should fix all the touchscreen freezes.