bts: extend bts_chan_load to allow counting tch only

Change-Id: I86f1d502649747b6b9aefcb39081b14110e8f494
diff --git a/openbsc/src/libbsc/bsc_ctrl_commands.c b/openbsc/src/libbsc/bsc_ctrl_commands.c
index 7e84797..3f4fee2 100644
--- a/openbsc/src/libbsc/bsc_ctrl_commands.c
+++ b/openbsc/src/libbsc/bsc_ctrl_commands.c
@@ -239,7 +239,7 @@
 
 	bts = cmd->node;
 	memset(&pl, 0, sizeof(pl));
-	bts_chan_load(&pl, bts);
+	bts_chan_load(&pl, bts, 0);
 
 	cmd->reply = talloc_strdup(cmd, "");