aml_audio_hal: Add environmental settings for audio server socket.

PD#SWPL-13795

Problem:
On customer's build image the default /vendor/lib path
is mounted as RO when audio server creates unix socket
from RO location there is a crash.

Solution:
Switch to a RW /opt directory for default unix socket
location and add another environmental variable to
allow separate settings.

Verify:
Verified on u212 platform.

Change-Id: I70cc24436add8a73e4194664ad4b790346c05836
2 files changed
tree: b224e3503790f5dc720260fa7517bff2e27980d3
  1. include/
  2. src/
  3. Makefile