audiohal: Improve master_vol test command. [1/1]

PD#SWPL-36186

Problem:
Need a command to return current master volume.

Solution:
Provide additional param to return the setting.

Verify:
master_vol s <vol>
master_vol g

Verify the command return the value just set.
Verified with AB311 s962e2 ref board.

Change-Id: Id253647e844cfdd7edff343e68f2497c88252d27
1 file changed
tree: 77f4b8a2dcb84881a54dbf03422a80b4a47ac0d9
  1. include/
  2. src/
  3. Makefile