JVET-AA0124: AmvpMerge mode enabling check when RPR is enabled and DMVD is disabled

Merged Zhi Zhang requested to merge ezhizng/ECM:FIX_FOR_JVET_Z0085_RPR_ENABLE_DMVD_DISABLE into master

AmvpMerge mode enabling check when RPR is enabled and DMVD is disabled

Edited by Vadim Seregin

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