Use audio_mode_t consistently

It was int or uint32_t.
Also make getMode() const.

Change-Id: Ibe45aadbf413b9158e4dd17f2b3bcc6355288d37
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 9fb666e..22915e6 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -563,7 +563,7 @@
     return NO_ERROR;
 }
 
-status_t AudioFlinger::setMode(int mode)
+status_t AudioFlinger::setMode(audio_mode_t mode)
 {
     status_t ret = initCheck();
     if (ret != NO_ERROR) {
@@ -5883,7 +5883,7 @@
     return chain;
 }
 
-void AudioFlinger::ThreadBase::setMode(uint32_t mode)
+void AudioFlinger::ThreadBase::setMode(audio_mode_t mode)
 {
     Mutex::Autolock _l(mLock);
     size_t size = mEffectChains.size();
@@ -6681,7 +6681,7 @@
     return status;
 }
 
-status_t AudioFlinger::EffectModule::setMode(uint32_t mode)
+status_t AudioFlinger::EffectModule::setMode(audio_mode_t mode)
 {
     Mutex::Autolock _l(mLock);
     status_t status = NO_ERROR;
@@ -6690,7 +6690,7 @@
         uint32_t size = sizeof(status_t);
         status = (*mEffectInterface)->command(mEffectInterface,
                                               EFFECT_CMD_SET_AUDIO_MODE,
-                                              sizeof(int),
+                                              sizeof(audio_mode_t),
                                               &mode,
                                               &size,
                                               &cmdStatus);
@@ -7340,7 +7340,7 @@
 }
 
 // setMode_l() must be called with PlaybackThread::mLock held
-void AudioFlinger::EffectChain::setMode_l(uint32_t mode)
+void AudioFlinger::EffectChain::setMode_l(audio_mode_t mode)
 {
     size_t size = mEffects.size();
     for (size_t i = 0; i < size; i++) {