Use ToneGenerator::tone_type consistently

Also remove defaults in startToneCommand(), they're not needed and the
default for tone type was nonsense.

Change-Id: I70fa8cee4f3dbb8c66ceb3719c8d3d2f447f05b9
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 28b1c89..30bbabd 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -786,7 +786,8 @@
     return NO_ERROR;
 }
 
-void AudioPolicyService::AudioCommandThread::startToneCommand(int type, audio_stream_type_t stream)
+void AudioPolicyService::AudioCommandThread::startToneCommand(ToneGenerator::tone_type type,
+        audio_stream_type_t stream)
 {
     AudioCommand *command = new AudioCommand();
     command->mCommand = START_TONE;