Support query microphones information.

Get list of all/currently active microphones from hal.

Bug: 64038649
Test: Manual Testing and Cts test
Change-Id: Id39cae38ba040f9bc91571e713487f87c2eb67b0
diff --git a/media/libaudiohal/2.0/DeviceHalLocal.cpp b/media/libaudiohal/2.0/DeviceHalLocal.cpp
index fc098f5..ec3bf78 100644
--- a/media/libaudiohal/2.0/DeviceHalLocal.cpp
+++ b/media/libaudiohal/2.0/DeviceHalLocal.cpp
@@ -184,6 +184,11 @@
         return INVALID_OPERATION;
 }
 
+status_t DeviceHalLocal::getMicrophones(
+        std::vector<media::MicrophoneInfo> *microphones __unused) {
+    return INVALID_OPERATION;
+}
+
 status_t DeviceHalLocal::dump(int fd) {
     return mDev->dump(mDev, fd);
 }