AudioFlinger: add audio session for device effects

Add specific audio session ID for effects applied to a
particular audio device.
Device specific effects will be attached to a particular audio sink or
source device identified by its unique audio port ID and will all use
this same session ID.
Only one session of this type exists on a given playback or record
thread.
All effects in this session apply to the same device ID and are created/released
when the routing (audio patch) of this thread output or input stream is updated.

Bug: 136294538
Test: make

Change-Id: I4e3a55ed1244b918429dd9e217b6efecc1ec6449
Merged-In: I4e3a55ed1244b918429dd9e217b6efecc1ec6449