vp9: Turn on the partition copy for speed 8. Tune threshold.
For speed 8, it speeds up the encoding on android by 6% for QVGA and 7.4% for VGA with the new threshold. Overall PSNR is improved by 0.667 for rtc. Change-Id: I4a644560b32c0b5b4e9f49ffb953d000413a3732
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