Changed scaling of MVs to use higher precision.
This is intended to be a no-op when scaling is not enabled, but is expected to result in more accurate prediction when references need to be scaled. However note all xs, yx, subpel_x and subpel_y values are now at higher than 1/16th precision. Change-Id: I4b22573ea290a31fc58ead980bb0d5e5a9e89243
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