vp8: Updates to noise level estimate.
-Use full bandwidth (when temporal layers is on) for checking switching. -Normalize metric wrt num_blocks. -Rounding fix to update of average noise level metric. -Make default internal denoiser mode == kDenoiserOnYUV (in denoiser set_parameters()). -Adjust some thresholds. Change-Id: Ib827512b25a7bf1f66c76d3045f3a68ce56b1cd2
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