Add vpx_clear_system_state() in SSIM based rdmult adjustments
Add vpx_clear_system_state() in SSIM based rdmult adjustments

Change-Id: I2a0cdec3bfce864e975aaa408cfdcb855db8680f

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