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

Remove the following mixports because of the usage of unsupported
flags:
 * virtual_deep_buffer
 * uplink downlink input
 * voip record
 * Multiroute

Rewire USB Device In and USB Headset In to go through primary input,
since uplink downlink input does not exist anymore.

Also, remove raw mixport and its uses, since it can cause sound
popping.

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.