vp8 dec: reset back to original code

Change-Id: I16da60c10167202a47ac0b0bcd82241cac9e8e1e
vp8 dec: sync to upstream va_vp8_dec.h definition

Change-Id: Ic0c0cf35e8cc0fa4e781ec31a17e36c7b8b933d4
vp8 dec: restore our previous fixes by Sean/Sammer

Change-Id: I0940c3c3fe4707f1ffcea462ada5c41e6c32c558
Merge pull request #9 from halleyzhao/master

VP8 parameter interface re-fix