JVET-O0220 method-1: Parse merge_subblock_flag conditioned on MaxNumSubblockMergeCand

Ruoyang Yurequested to merge
ruoyangyu/VVCSoftware_VTM:O0220_method_1 into master

JVET-O0220 method-1: Parse merge_subblock_flag conditioned on MaxNumSubblockMergeCand (Align SW to spec text).

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