goldfish-codecs: add avcdec

This is used to pass h264 decoding to host h264 decoders.

BUG: 124388359

This CL is based on the following cl:
joshuaduong@
ag/9406402 and ag/9406404

Change-Id: I52a17a917e7bee24ab8e46317d1715ead11e469c
8 files changed