hal: Reduce debug logs

Remove or mute debug logs that are not necessary in debugging
usual audio HAL issues.

Change-Id: I832d9d95b6b24f64871524efbe65dd57850afd41
diff --git a/hal/voice.c b/hal/voice.c
index 72c3372..034eaa0 100644
--- a/hal/voice.c
+++ b/hal/voice.c
@@ -435,7 +435,7 @@
     bool in_call_rec = false;
 
     if (!in) {
-       ALOGE("%s: input stream is NULL", __func__);
+       ALOGV("%s: input stream is NULL", __func__);
        return in_call_rec;
     }