Set up QCOM HAL variants

Change-Id: I1a6897145f34aaed0c03d76f9dea63c8896c76f5

Conflicts:

	default.xml
Include QCOM CAF HALs by default

* Reduce confusion in roomservice

Change-Id: I3f9650d8adc65343dc7f51db9750c0a99c830aca

Conflicts:

	default.xml
Make QCOM CAF audio HALs platform specific

Change-Id: Ie912fdb42b33feb5a75679de9f460e15fa9c6b49

Conflicts:

	default.xml