Xiaomi overrides the default audio policy configuration from
vendor/etc/audio/sku_lahaina inside of AudioPolicyManager,
and uses vendor/etc/audio_policy_configuration_mi.xml.

Use the proper configuration, but keep copying it into the old
location, since our AudioPolicyManager only knows how to load
it from there.

This reverts commit a3ce4ebc.

This reverts commit f6bdf3e6.