Change the log of gaining a buffer twice from info level to verbose

Bug: 120505756
Test: build on master branch; run on Vega on oc-dr1-daydream-dev branch
Change-Id: I5768a4715e9a659ca3231d8105d36bd0c4f5ba13
diff --git a/libs/vr/libbufferhub/producer_buffer.cpp b/libs/vr/libbufferhub/producer_buffer.cpp
index c177970..de03fad 100644
--- a/libs/vr/libbufferhub/producer_buffer.cpp
+++ b/libs/vr/libbufferhub/producer_buffer.cpp
@@ -171,7 +171,7 @@
 
   if (BufferHubDefs::IsClientGained(current_buffer_state,
                                     client_state_mask())) {
-    ALOGI("%s: already gained id=%d.", __FUNCTION__, id());
+    ALOGV("%s: already gained id=%d.", __FUNCTION__, id());
     return 0;
   }
   if (BufferHubDefs::AnyClientAcquired(current_buffer_state) ||