libmix: use surfaceWidth/surfaceHeight to reflect the buffer size allocated by gralloc

BZ: 145977

720p surface buffers are always allocated in webrtc, in this scene, vaCreateSurfaces
need accecpt surfaceWidth/surfaceHeight as the buffer size allocated by gralloc.

Change-Id: I50cc6f5026c2f36b7659980955377ec20aa37974
Signed-off-by: Gu, Wangyi <wangyi.gu@intel.com>
1 file changed