hevc/rext: update boundary strength for chroma deblocking filter
hevc/rext: fixing rdpcm and scaling list for Range Extension
-new rext bitstreams:
PERSIST_RPARAM_A_RExt_Sony_1.bit           ok    =
QMATRIX_A_RExt_Sony_1.bit                  ok    =
SAO_A_RExt_MediaTek_1.bit                  ok    =
hevc/rext: remove warning for cross component prediction
fate/hevc: update with new Rext bitstreams