Bluedroid: Disable bluedroid stack when bluez stack is enabled

When bluez stack is enabled by setting BOARD_HAVE_BLUETOOTH_BLUEZ
don't compile the bluedroid stack

Change-Id: I5324769b1349dc5f288a3bdb0bf4cc38ae3043d3
Bluetooth: Add feature flag to compile the audio stub

This enables the compilation of audio stub of bluedroid only
if Bluedroid related feature flag is enabled.

Change-Id: I4a9b9b26824d7eaede8a9a7b3c2093fd33a2ee91
Merge "Bluedroid: Disable bluedroid stack when bluez stack is enabled"
Merge "Bluetooth: Add feature flag to compile the audio stub"
Bluetooth: Change Sampling Frequency to 48 kHz

Change Default Sampling Frequency to 48 kHz by default to
match Audio Source.
CRs-fixed: 436686
Change-Id: I0a4aa9ca61964e76220c77fa60c281f7a5df58b4
Merge "Bluetooth: Change Sampling Frequency to 48 kHz"
Merge branch 'jb-mr1' of https://github.com/AOKP/external_bluetooth_bluedroid into jb-mr1