vp9: Simplify the logic in denoiser SSE2 code.
Block size passed into denoiser filter is always >= BLOCK_8X8 (in vp9_pick_inter_mode), it is not necessary to check smaller block size. Passed the bitexact test on clips with different resolutions and noise levels. Change-Id: I19fa3195d18c27d9e5de60dc11cff1522ef3714e
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