audiopolicy: Add support for multiple display ports.

Sort devices added to policy manager based on device type.
For devices of same type sort based on id, which places the
latest devices in the front of the list.
For devices of same type, no id, fallback to default
sort using pointer address.
This is needed when same type of different devices can be connected.

Bug: 111196161
Test: manual audio smoke tests.

Change-Id: I428e9f0cb5d8e9700be7b96cea665bc2e0d2805e