bluetooth: Remove BT-related sources.

The Android emulator doesn't support Bluetooth, so remove any
code that is related to it. This reduces the amount of code that
needs to be integrated from upstream.

If really needed, BT support might be introduced later after the
big refactoring is complete.

Change-Id: I19d2bdc901aef89bec0418e4f345a5f1758de7a1
11 files changed