Non-rd variance partition: Adjustments to reduce dragging artifact.
For non-rd variannce partition, speed >= 5: Adjustments to reduce dragging artifcat of background area near slow moving boundary. -Decrease base threshold under low source noise conditions. -Add condition to split 64x64/32x32 based on average variances of lower level blocks. PSNR/SSIM metrics go down ~0.7/0.9% on average on RTC set. Visually helps to reduce dragging artifact on some rtc clips. Change-Id: If1f0a1aef1ddacd67464520ca070e167abf82fac
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