Add back mvpIdx signaling when DMVD is turned off by configure. Add back MVD sign prediction for AmvpMerge mode in case JVET_Y0129_MVD_SIGNAL_AMVP_MERGE_MODE is off.
NOTE: no impact on CTC.
Add back mvpIdx signaling when DMVD is turned off by configure. Add back MVD sign prediction for AmvpMerge mode in case JVET_Y0129_MVD_SIGNAL_AMVP_MERGE_MODE is off.
NOTE: no impact on CTC.