Display brightness is handled through composer,
and we don't have any other light emitting hardware.

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.