Add I2S-PCM slave mode for SCO

 * M7 needs us to configure I2SPCM for SCO and set the voice mode.

Change-Id: I98a9528af62f9c4fef075927f00a8aafdbeb4ee3
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_external_bluetooth_bluedroid into jb-mv