UVD on RV770/RV790

[Christian König]

Hi everyone,

Sorry to disappoint you but I've made a mistake in classifying the 
different UVD hardware generations. RV770 and RV790 have the same UVD 
block as on RS780 and RS880 and not the same as RV710, so it's currently 
NOT supported.

It's may fault because of the strange chipset numbering (RV770/RV790 is 
earlier than RV710). I'm working on it and the difference isn't so big 
so it might be possible to handle those as well.

Cheers,
Christian.