Remove usages of USE_XML_AUDIO_POLICY_CONF

The usages were only checking that the property is set
to catch attempts to update to Q while still using legacy
configurations.

Bug: 132435217
Test: build various devices
Change-Id: Ib8bda8ab7f791ac5cd3875816de46a42f0a4cbb6
Merged-In: Ib8bda8ab7f791ac5cd3875816de46a42f0a4cbb6
2 files changed