audio policy: apply default device volume

Make sure that we apply default device volume to
active outputs in case no specific volume for selected
device is received afterward.

Bug: 9760269.
Change-Id: I216de40396e1075e77493c97e8b192cd3a31d546
Merge tag 'android-4.3_r3.1' into katkiss-4.3

Android 4.3 Release 3.1

Conflicts:
	audio/AudioPolicyManagerBase.cpp

Change-Id: I2d4e0dc3bd7874d80e356a106c4bd9b223dc0c8e