Fix mic enumeration CTS fail on marlin.

The mic enumeration APIs only support on audio hal v4. Marlin failed due
to on audio hal v2. Make the APIs return mic with unknown
characteristics if the native call fail.

Bug: 77732156
Bug: 77732289
Test: run cts on marlin and walleye
Change-Id: I64b3e6a249ad76b754e841d630e8cf178dde9a86