Refine setting config max frame size for VP8 in libMix layer.

BZ: 166007

Calculating the max frame size equals to ratio multiples average bitrate.
Add passing down to driver layer.

Change-Id: I882dc1fdf14a8411e7c647de0c7532f3b0ac1fb9
Signed-off-by: liubolun <bolun.liu@intel.com>
3 files changed