fix FB in SHVC

Conflicts:
	gpac/modules/openhevc_dec/openHevcWrapper.c
	libavcodec/hevc.c
	libavcodec/pthread_frame.c
fix FB Scalability

Conflicts:
	libavcodec/hevc.c
	libavcodec/hevc_refs.c
Revert "fix FB Scalability"

This reverts commit 830affafc51130ba348236dae4049d1bb3f21c48.
Revert "fix FB in SHVC"

This reverts commit 107df39c428cf810a1a13f56f74d2c36a20f14a2.