policy-hal: enable custom audio policy

-This change enable custom audio policy and also includes
the fixes that went in to audio policy manager.

audio policy: add support for external audio sources
Change-Id: If5805d58a4356b2f681f1aabf54375f62b55b98a

Add setMasterMono and getMasterMono
Change-Id: I32dc1fcecf285967a61bd508af3bb299595db57d

AudioPolicy: AudioOutputDescriptor set/get for patch handle
Change-Id: I5bffecf7a157ec042d749064208bc6c279008542

AudioPolicyManager: force encoded surround setting
Change-Id: I0f7a486bf1aa7a27f15cf220e2c75ef23f8f8536

audio: several fixes in audio routing callbacks
Change-Id: Ieb0d9f92f563a40552eb31bc0499c8ac65f78ce4

audio policy: move volume table to XML file
Change-Id: I78c91bc3378b6c47202abe7b5c1c1e011ff62eed

AudioPolicy: capture sample rate 0 is route-specific default
Change-Id: I7d193640572c08ab5e5f1ecfc8ad6d31635967dd

audio policy: remove deserialization from policy objects
Change-Id: I1ce798848f4657b37e47446c9fbdc63f7ed0390e

DO NOT MERGE - audio policy: disable concurrent capture
Change-Id: I9085918f1f7b12e28430958cceb768bb29c12bdb

audio policy: select output with best sample format match
Change-Id: I31981940be5d1c06d713d52187cfb0a7bf355773

audio policy: audio sessions on input descriptors
Change-Id: I915a65989a7fd0d3cbe2fcf5a0aee2ea0df5f4f5

Call SoundTrigger::setCaptureState in AudioPoilcyManager::closeAllInputs
Change-Id: I613434ecacce3ef03a657008fd94c314948ba2b8

Change-Id: Iee8ef2647691fe1167b95f19357f17c28f54bf0e