pdch_ul_controller: log reserved frame numbers

When debugging frame number offset problems betwen l1 and below and the
upper layers of the PCU, it may be helpful do know which blocks/frame
numbers got reserverd for uplink transmissions.

Change-Id: I4277c572a4cc6cbbf3ac4e67442c9036be687627
Related: OS#5198
diff --git a/src/pdch_ul_controller.c b/src/pdch_ul_controller.c
index 1746333..c0e26de 100644
--- a/src/pdch_ul_controller.c
+++ b/src/pdch_ul_controller.c
@@ -193,6 +193,9 @@
 	struct rb_node **n = &(ulc->tree_root.rb_node);
 	struct rb_node *parent = NULL;
 
+	LOGPDCH(ulc->pdch, DRLCMAC, LOGL_DEBUG, "Reserving FN %u for type %s\n",
+		item->fn, get_value_string(pdch_ul_node_names, item->type));
+
 	while (*n) {
 		struct pdch_ulc_node *it;
 		int res;