Audio V4: Support query microphones information

Get list of all/currently active microphones from hardware.
Part of the device enumeration feature.

Bug: 64038649
Test: test/vts-testcase/hal/script/update_makefiles.py
Change-Id: I08051f1d6013672dea8f3866776864e87ff35297
Rebased for 4.0 by:
Signed-off-by: Kevin Rocard <krocard@google.com>
Originally written by:
Signed-off-by: Ricardo Garcia <rago@google.com>