bluedroid: Fix build with gcc 4.8+

Use -Wno-error=unused-parameter with gcc >= 4.8

Change-Id: I330a56b0363b90118628bc3b30451f8921ca6f60
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
bluedroid: Fix build with gcc 4.8+

Use -Wno-error=unused-parameter with gcc >= 4.8

Change-Id: Id7299c8f0a1e2dd683647d49225342ebfa0a8dcf
a2dp: Set the default A2DP bitrate to high quality

Allows bluedroid to calculate the proper A2DP bitpool size.
This resolves the main A2DP audio quality issues with Android 4.2,
but does not address the difference in audio output gain/volume as
compared with Android 4.1.

Setting the output volume level to approximately 80% in conjunction
with this change seems to result in comparable audio quality

Change-Id: Ic05c3278ebe9288d00926fab8b7c1a646fd861cd
Merge pull request #1 from moongato/jb-mr1.1

a2dp: Set the default A2DP bitrate to high quality