libmix:enable native buffer in libmix

BZ: 18370

add native buffer support in libmix

Signed-off-by: ywan171 <yi.a.wang@intel.com>

Change-Id: I424d0f11aae17bf9f18590ad7a5193ea966cde5f
Reviewed-on: http://android.intel.com:8080/27897
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>
12 files changed