Adjust full-pixel clamping and motion vector limit calculation

Do mvp clamping in full-pixel precision instead of 1/8-pixel
precision to avoid error caused by right shifting operation.
Also, further fixed the motion vector limit calculation in change:
b7480454706a6b15bf091e659cd6227ab373c1a6

Change-Id: Ied88a4f7ddfb0476eb9f7afc6ceeddbf209fffd7
5 files changed