Use audio_mode_t consistently

Change-Id: I7a30fe3f66933aed8b5a6185553112575b4de1a7
diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index ba5280d..5f420a4 100755
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -481,7 +481,7 @@
     pthread_mutex_t lock;       /* see note below on mutex acquisition order */
     struct mixer *mixer;
     struct mixer_ctls mixer_ctls;
-    int mode;
+    audio_mode_t mode;
     int devices;
     struct pcm *pcm_modem_dl;
     struct pcm *pcm_modem_ul;
@@ -2323,7 +2323,7 @@
     return -ENOSYS;
 }
 
-static int adev_set_mode(struct audio_hw_device *dev, int mode)
+static int adev_set_mode(struct audio_hw_device *dev, audio_mode_t mode)
 {
     struct tuna_audio_device *adev = (struct tuna_audio_device *)dev;