audio: configs: update policy configuration to fix vts failure

Update default audio_policy_configuration.xml to remove configurations
that are not compatible with aosp system image and are causing vts failures.
Add custom audio policy configurations at /vendor/etc/audio/ to be picked
up by qti customized system image.

Change-Id: Iae1f4c72090ef5a0c6472083dce8b0065beb6851