Move LLC enqueuing and retransmit timer to MS object

The LLC queue is already in the MS object. The LLC timer and most
of the logic to enqueue its data is independent from the TBF.

Change-Id: I56b89fcac838d8eb732b629734d5e458e9c806d1
diff --git a/src/tbf.cpp b/src/tbf.cpp
index cb5d9f3..5597ba4 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -950,3 +950,8 @@
 
 	return buf;
 }
+
+int tbf_establish_dl_tbf_on_pacch(struct gprs_rlcmac_tbf *tbf)
+{
+	return tbf->establish_dl_tbf_on_pacch();
+}