TBF: decrease logging verbosity for traffic

Change-Id: If43aa9895abf58602556c986a633ff93a6f00b06
diff --git a/src/tbf_ul.cpp b/src/tbf_ul.cpp
index 1560eb0..46d4d12 100644
--- a/src/tbf_ul.cpp
+++ b/src/tbf_ul.cpp
@@ -84,7 +84,7 @@
 
 		if (frame->is_complete) {
 			/* send frame to SGSN */
-			LOGPTBFUL(this, LOGL_INFO, "complete UL frame len=%d\n", m_llc.frame_length());
+			LOGPTBFUL(this, LOGL_DEBUG, "complete UL frame len=%d\n", m_llc.frame_length());
 			snd_ul_ud();
 			bts->llc_ul_bytes(m_llc.frame_length());
 			m_llc.reset();