Add API for listing stations at wmediumd am: ab76216841 am: 0c959925e1 am: 5ddafbfabc am: 45a7f09284

Original change: https://android-review.googlesource.com/c/platform/external/wmediumd/+/1990341

Change-Id: I04897ca6bd449d3a5dc44924338e1ae607f77f3b