create separate macro for BDMVR software optimization in JVET-X0049

Han Huangrequested to merge
hanhuang/ECM:JVET_X0049_BDMVR_SW_OPT into master

Separate macro for BDMVR software optimization. As a standalone item. However, JVET_X0049_ADAPT_DMVR requires the software optimization to be enabled.

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