audiopolicy: skip opening mmap profile during new device connection

During the new device connection, all listed mix ports ported are
opened, but for mmap case, when output or input is opened, it neads to
call createMmapBuffer which goes till audio DSP, adding up to latency
during device connections.

Skip opening input/output for mmap profiles during device connections.
Once, device is connected, if client needs a mmap session, mmap
sessions can be opened on the go.

Flag: EXEMPT bugfix
Bug: 345692843
Test: connect an external device, check opened inputs / outputs,
      verify logs, after device connection play mmap
Test: run audiopolicy_tests
Change-Id: Iefcc3db8f30348347e1b107a6281cf8b6268d493
Merged-In: Iefcc3db8f30348347e1b107a6281cf8b6268d493