vp9 non-rd mode: Modification for detected skin areas.
If a superblock contains alot of "skin" then force split of 64x64 partition, and make some adjustments in mode selection. This helps to reduce artifacts on moving face/skin areas at low bitrates. Little/no change in metrics: avgPSNR/SSIM down by ~0.12%. Small encoding time increase < 1%. Change-Id: Ic57f52148c3716f391419fab0530d916e4c1d186
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