vp9: Add feature to copy partition from the last frame.
Add feature to copy partition from the last frame. The copy is only done under certain conditions that SAD is below threshold. Feature is currently disabled, until threshold is tuned. Feature will be initially used for Speed 8 (ARM). Under extreme case of always copying partition for speed 8: Encode time is reduced by 5.4% on rtc_derf and 7.8% on rtc. Overall PSNR reduced by 2.1 on rtc_derf and 0.968 on rtc. Change-Id: I1bcab515af3088e4d60675758f72613c2d3dc7a5
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