VP8 encoder can support VBR method since using the new media kernel
VP8 encoder can support VBR method since using the new media kernel

This fixes https://github.com/01org/intel-vaapi-driver/issues/164

Signed-off-by: Xiang, Haihao <8d677183e5993577d4fa73a419b76987913292d6@intel.com>
(cherry picked from commit 1b0c31248f73759736e2e99bb8046c17b81bcc51)

01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver