audiopolicy: fix VoIP and system sound routing concurrency

On platforms with dedicated output profiles for VoIP, activity on
all output streams should be considered when use case priority is
evaluated while selecting current device on a given output stream.

For now, implement a simple rule taking only into account output streams
attached to the same audio HAL module and limited to voice call use
case.
This should be extended to all use cases with a refined rule
considering mutually exclusive devices (using same backend) as opposed
to all streams on the same audio HAL module.

Bug: 109640706
Test: repro steps in b/109640706
Change-Id: I2cea35911a6121980f128a3a3d694699364854eb