audio: fix input device selection

Change-Id: Ia338cdf680254de1c949771f67894b0b153b5630
Add generic key layout with G-Key remapped to app-switch

Change-Id: Id2e968a740d67603a87c2a0abe7178cd3d177c4f
Add overlay for keys and bt tethering

Change-Id: I395610e7a274fca501162040312015c3c5e4540c
Merge remote-tracking branch 'nameless/android-4.4' into cm-11.0