Make get_zero_mtion_factor avoid using cpi
Make get_zero_mtion_factor avoid using cpi

Change-Id: Id1b41c3b77a7eae6c2934efbff2608094ee7b3c5

webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx