vp9: SVC: Rework the usage of base_mv for SVC.
Set the base_mv_aggressive for temporal enhancement layers (TL > 0). Under the aggressive mode, skip the NEWMV depending on the SSE of the base_mv. Also reduce the subpel motion to 1/2 under aggressive mode if base_mv is good. Speedup ~3% with small/negligible loss in quality on RTC. Affects speed >= 6. Change-Id: I89341b279cad6da2a04b76d5e726016191dacdb8
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