Use the scoreboard for AVC encoding on Ivy
Use the scoreboard for AVC encoding on Ivy

This is backported from the Haswell and it is required in order to
add the MVP prediction as it is based on the neighbour macroblocks.

Signed-off-by: Zhao Yakui <21bae65ecea50a19bd9d0fef489914760189fd5b@intel.com>

uartie/vaapi-intel-driver,uartie/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,chenxianqin/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,chenxianqin/vaapi-intel-driver,gbeauchesne/libva-intel-driver,gbeauchesne/libva-intel-driver,chenxianqin/vaapi-intel-driver,chenxianqin/vaapi-intel-driver,uartie/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,halleyzhao/libva-intel-driver-fdo,halleyzhao/libva-intel-driver-fdo,uartie/vaapi-intel-driver,halleyzhao/libva-intel-driver-fdo,gbeauchesne/libva-intel-driver,chenxianqin/vaapi-intel-driver,uartie/vaapi-intel-driver,gbeauchesne/libva-intel-driver,gbeauchesne/libva-intel-driver,halleyzhao/libva-intel-driver-fdo