libmix: remove target names in makefiles for VP8

BZ: 83713

Remove target names in makefiles.

Change-Id: I20a2a64dae6de3ce0f91c24ce7b22577b9482a32
Signed-off-by: Tianmi Chen <tianmi.chen@intel.com>
Reviewed-on: http://android.intel.com:8080/92718
Reviewed-by: cactus <cactus@intel.com>
Reviewed-by: Feng, Wei <wei.feng@intel.com>
Reviewed-by: Fert, Laurent <laurent.fert@intel.com>
Reviewed-by: Shi, PingX <pingx.shi@intel.com>
Tested-by: Shi, PingX <pingx.shi@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
3 files changed