Fix clang-tidy warnings in audio and playerservice.

* Add explicit keyword to conversion constructors.
Bug: 28341362
* Use const reference type for read-only parameters.
Bug: 30407689
Test: build with WITH_TIDY=1

Change-Id: I265f3b094e08d5705b506b3fbba51439c134af84
Merged-In: I265f3b094e08d5705b506b3fbba51439c134af84
diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 26a0bb2..d4b25f0 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -312,7 +312,7 @@
 
     static audio_mode_t getPhoneState();
 
-    static status_t registerPolicyMixes(Vector<AudioMix> mixes, bool registration);
+    static status_t registerPolicyMixes(const Vector<AudioMix>& mixes, bool registration);
 
     static status_t startAudioSource(const struct audio_port_config *source,
                                       const audio_attributes_t *attributes,