libmix: fix the buffer status messy issue

BZ: 20262 18785

when getting new sps/pps, but the resolution is not
changed, we won't sent out format_changed, it is a
workaround here
Signed-off-by: Weian Chen <weian.chen@intel.com>

Change-Id: I670b329df58c5fa494a9e5bb69baee92798dbc62
Reviewed-on: http://android.intel.com:8080/33841
Reviewed-by: Wang, Yi A <yi.a.wang@intel.com>
Reviewed-by: Ding, Haitao <haitao.ding@intel.com>
Tested-by: Ding, Haitao <haitao.ding@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
1 file changed