audio:Changes to enable LPA/Tunnel

 Changes to enable LPA/Tunnel mode

Change-Id: Ic7381c4c45b67ae0cfdcc4a01fc85014ca95dec2
libhardware_legacy: Add MSM specific flags, devices and channels.

- Add support for MSM flags, devices and channels

Change-Id: I6cb5f34b49e24e6d6f97821189bdb6e96ce283a8