bts: extend bts_chan_load to allow counting tch only

Change-Id: I86f1d502649747b6b9aefcb39081b14110e8f494
diff --git a/openbsc/src/libbsc/paging.c b/openbsc/src/libbsc/paging.c
index fcb4deb..e3795b3 100644
--- a/openbsc/src/libbsc/paging.c
+++ b/openbsc/src/libbsc/paging.c
@@ -119,7 +119,7 @@
 	int count;
 
 	memset(&pl, 0, sizeof(pl));
-	bts_chan_load(&pl, bts);
+	bts_chan_load(&pl, bts, 0);
 
 	switch (rsl_type) {
 	case RSL_CHANNEED_TCH_F: