i965_drv_video: new ring buffer flag
i965_drv_video: new ring buffer flag

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