vpp: move reference frames to pipeline parameter buffer.
vpp: move reference frames to pipeline parameter buffer.

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