Reduce line buffer size for Wiener filter.
This patch forces the vertical filtering for the top and bottom rows of a processing unit for the Wiener filter to be 5-tap. The 5-taps are derived from the primary 7-tap fitler by forcing the taps at the end to be zero, and absorbing their weights into the other taps to maintain normalization. This will effectively reduce the line buffer size for luma Wiener filter to 4 (from 6). Change-Id: I5e21b58369777eabf553a8987387d112f98a5598
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