Avoid deadlock in OMX::freeNode by making sure OMXCodecObserver does not hold the last reference of OMXCodec object - do not merge

cherry-picked from: I4c79b66a900c527e3ae6a833f76d5da1b75c5a89

bug - 3336424

Change-Id: I2d8ecb79a5422342988c195c012c9e6327ac457a
3 files changed