libhardware_legacy: Add MSM specific flags, devices and channels.

- Add support for MSM flags, devices and channels

Change-Id: I88ff548a4ac0629ea80a0103648b5d8f7acfd7da
(cherry picked from commit 47fc1126a6d6d4e7716b6ca65490550744c909f2)
(cherry picked from commit dc8add29ede96579400e07721ee2510cf40da629)

Conflicts:
	audio/AudioPolicyManagerBase.cpp