JVET-R0225: Use two separate flags for ALF chroma PH/SH control
JVET-R0225: Use two separate flags (one for Cb, one for Cr) to replace ph_alf_chroma_idc in PH and sh_alf_chroma_idc in SH
JVET-R0225: Use two separate flags (one for Cb, one for Cr) to replace ph_alf_chroma_idc in PH and sh_alf_chroma_idc in SH