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Matching the recents changes in libwebrtc[0] enable MediaTek just for H264

[0] https://chromium.googlesource.com/external/webrtc/+/5b6891afddcef18ea699efcd457dfab80c22ac70

BUG=848511
R=braveyao@chromium.org

Change-Id: I0431b48730eb14149530a1265d173cca7e8944f3
Reviewed-on: https://chromium-review.googlesource.com/1086408Reviewed-by: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565033}