Add setMasterMono and getMasterMono

Bug: 15283594
Bug: 22700363
Change-Id: I32dc1fcecf285967a61bd508af3bb299595db57d
diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImplLegacy.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImplLegacy.cpp
index 13af3ef..08b2a3b 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImplLegacy.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImplLegacy.cpp
@@ -619,4 +619,14 @@
     return INVALID_OPERATION;
 }
 
+status_t AudioPolicyService::setMasterMono(bool mono)
+{
+    return INVALID_OPERATION;
+}
+
+status_t AudioPolicyService::getMasterMono(bool *mono)
+{
+    return INVALID_OPERATION;
+}
+
 }; // namespace android