Tyler Gunn a3fc54f0d8 DO NOT MERGE Add capability to determine if downgrade to audio is denied.
By default we assume downgrade to audio is permitted; this capability
probides a means for a carrier to specifically deny that.

Bug: 22728624

Change-Id: I75e0a5b9e5ad2d970003a4691b6fc0ac0dcfe9e0
2016-01-27 19:45:23 -08:00
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