volume_listener: Silence volume listener log

Silence volume listener log for offload use case

Change-Id: I1b6344dbb898d64ae52a7d3ef60d5666703516f9
diff --git a/post_proc/volume_listener.c b/post_proc/volume_listener.c
index 51f8803..4277cf3 100644
--- a/post_proc/volume_listener.c
+++ b/post_proc/volume_listener.c
@@ -344,7 +344,7 @@
     if (in_buffer->raw != out_buffer->raw) {
         memcpy(out_buffer->raw, in_buffer->raw, out_buffer->frameCount * 2 * sizeof(int16_t));
     } else {
-        ALOGW("%s: something wrong, didn't handle in_buffer and out_buffer same address case",
+        ALOGV("%s: something wrong, didn't handle in_buffer and out_buffer same address case",
               __func__);
     }