Limit Key frame Intra modes checks.
Most of the focus so far has been on inter frames. At high speed settings the key frame is now taking a high % of the cycles. This patch puts in some masking to reduce the number of INTRA modes searched during key frame coding (as already happens for inter frames) at higher speed settings TODO: Develop this further with either adaptive rd thresholds when choosing which intra modes to consider or some other heuristic. Impact. At high speed settings on some clips the key frame was starting to dominate. In a coding of the first 50 frames of AKIYO at speed 2 limiting the key frame intra modes to DC or TM_PRED resulted in ~30% overall speedup. For Bus the number was lower at ~4-5%. Change-Id: I7bde68aee04995f9d9beb13a1902143112e341e2