Adjustment on limiting cyclic refresh on steady blocks.
Adjust the qp threshold and consec_zeromv threshold for limiting cyclic refresh. Also increase the refresh period when the limit amount is significant, and some code-cleanup. Small gain in PSNR/SSIM metrics: ~0.25/0.3 gain on RTC set, speed 7. Change only affects non-screen content. Change-Id: I1ced87a89a132684c071e722616e445b2d18236a
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