Add support for MPEG audio elementary streams in HLS

In the new KitKat HLS solution support for elementary
audio streams was added. According to a comment both AAC
and MPEG audio should be supported, but only AAC is
actually implemented. When streaming an MPEG audio stream
the whole phone would freeze. This commit implements support
for MPEG audio as well.

Change-Id: I083961599d5316b76da9fe47c8561d34569a456d
Merge "Add support for MPEG audio elementary streams in HLS" into du44