vp9_denoiser_sse2: refactor the code.
vp9_denoiser_sse2: refactor the code.

Combined vp9_denoiser_8xM_sse2 and vp9_denoiser_4xM_sse2 into one
function vp9_denoiser_NxM_sse2_small and passed the bitexact testing.
Changed the name of the function vp9_denoiser_64_32_16xM_sse2 to
vp9_denoiser_NxM_sse2_big.

Change-Id: Ib22478df585994dd347ebae04202c0b701e7f451

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