motion_var: computer motion_mode_cost from cdf
Initialize mode cost using frame-level cdf. Also in rd selection stage, cdf is updated per 64x64. Performance gain 0.20% Still suboptimal since in real bitstream packing, cdf is updated per symbol. Per symbol update in RDO is work in progress. Change-Id: I5062af91d8b00e5bf4c08abd0a7bfb0e5b27a619
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