Enable cfi for libvpx

Only enabling CFI for android for libvpx.
Bug: 158010610
Bug: 173497308
Test: ran atest DecoderConformanceTest, ImageReaderDecoderTest,
VideoDecoderPerfTest, VideoEncoderTest.  Compare the
before and after enabling CFI results since there was a number of tests
that were initially failing.

Change-Id: Ia4aa61c62ff55ced44fa58709fddd01b99c2b304
2 files changed