Minor changes to the VP9 decode API to remove fields that are not needed.
Minor changes to the VP9 decode API to remove fields that are not needed.

Signed-off-by: Wang, Ce <7028f5f79f3cfdbc8e0376d7b1af81b453a2b47a@intel.com>
Signed-off-by: Jonathan Bian <9991297f52a6f9abf50455fb144f81941846d99c@intel.com>

halleyzhao/libva-fdo,CyanogenMod/android_hardware_intel_libva,halleyzhao/libva-fdo,android-ia/hardware_intel_libva,android-ia/hardware_intel_libva,CyanogenMod/android_hardware_intel_libva,halleyzhao/libva-fdo,CyanogenMod/android_hardware_intel_libva,android-ia/hardware_intel_libva