Improved intrinsic version of vp8_denoiser_filter_neon
Improved intrinsic version of vp8_denoiser_filter_neon

Used horizonal add instructions instead of adding
byte lanes.  The encoder performance improved by
~4% for the test clip used.

Change-Id: Iaddd10403fcffb5b3f53b1f591ab2fe0ff002c08

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