vp9-svc: Allow for adapt_rd_thresh with row-mt.
Set adaptive_row_thresh_mt = 1 at speed >= 7, for svc when multi-threading is used with row-mt. This allow the adaptive_rd_thresh feature to be used in the nonrd-pickmode. ~1-2% speedup for SVC encoding with small quality loss (< 0.6%) on RTC set. Change-Id: Iab9878dff117bccdaef3e4d0645165db9808cdfc
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