Reduce the motion interpolation filter taps for inter prediction
blocks with widths or heights smaller than or equal to 4 to alleviate the memory
bandwidth increase.

AWCY HL: 0.01% Y, -0.20% U, -0.29% V (positive number means loss)

Change-Id: Ic454340e20aea2f1aae622336990f24a9e5b54d8