Add AudioParameter keyAudioLanguagePreferred

This parameter will be used to set user's preferred audio language
to the MSD HAL. The MSD HAL will use this as a preference indication
when selecting an audio presentation to decode and render
for next generation audio codecs such as AC-4.

Bug: 63901775
Test: make
Change-Id: Ic1da11ced50857f62affd636ba197fb8e6759110
Signed-off-by: Previr Rangroo <prang@dolby.com>

media/libaudioclient/include/media/AudioParameter.h

@@ -64,6 +64,9 @@ public:
     static const char * const keyPresentationId;
     static const char * const keyProgramId;
 
+    //  keyAudioLanguagePreferred: Preferred audio language
+    static const char * const keyAudioLanguagePreferred;
+
     //  keyStreamConnect / Disconnect: value is an int in audio_devices_t
     static const char * const keyStreamConnect;
     static const char * const keyStreamDisconnect;

media/libmedia/AudioParameter.cpp

@@ -36,6 +36,8 @@ const char * const AudioParameter::keyBtNrec = AUDIO_PARAMETER_KEY_BT_NREC;
 const char * const AudioParameter::keyHwAvSync = AUDIO_PARAMETER_HW_AV_SYNC;
 const char * const AudioParameter::keyPresentationId = AUDIO_PARAMETER_STREAM_PRESENTATION_ID;
 const char * const AudioParameter::keyProgramId = AUDIO_PARAMETER_STREAM_PROGRAM_ID;
+const char * const AudioParameter::keyAudioLanguagePreferred =
+        AUDIO_PARAMETER_KEY_AUDIO_LANGUAGE_PREFERRED;
 const char * const AudioParameter::keyMonoOutput = AUDIO_PARAMETER_MONO_OUTPUT;
 const char * const AudioParameter::keyStreamHwAvSync = AUDIO_PARAMETER_STREAM_HW_AV_SYNC;
 const char * const AudioParameter::keyStreamConnect = AUDIO_PARAMETER_DEVICE_CONNECT;