[PORT FROM R1][libmix] new encoder library

BZ: 5809

New encoder common library

Change-Id: I33a1896ac3efaf8697d9ee9e32b02932d9c2c896
Orig-Change-Id: I1c402c8d4b468011d892538f229d28f6f5abdcb0
Signed-off-by: Weian Chen <weian.chen@intel.com>
Reviewed-on: http://android.intel.com:8080/18318
Tested-by: Sang, Shuduo <shuduo.sang@intel.com>
Reviewed-by: Monnier, OlivierX <olivierx.monnier@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
14 files changed