bsc: Use the BSC RF CTRL to change the RF state of the TRXs

Use the delayed scheduling feature of the osmo_bsc_rf class to
avoid crashing the site controller of the nanoBTS.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
index 8f0db7e..6802b42 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
@@ -388,19 +388,19 @@
 {
 	int locked = atoi(cmd->value);
 	struct gsm_network *net = cmd->node;
-	struct gsm_bts *bts;
 	if (!net) {
 		cmd->reply = "net not found.";
 		return CTRL_CMD_ERROR;
 	}
 
-	llist_for_each_entry(bts, &net->bts_list, list) {
-		struct gsm_bts_trx *trx;
-		llist_for_each_entry(trx, &bts->trx_list, list) {
-			gsm_trx_lock_rf(trx, locked);
-		}
+	if (!net->bsc_data->rf_ctrl) {
+		cmd->reply = "RF Ctrl not enabled";
+		return CTRL_CMD_ERROR;
 	}
 
+	osmo_bsc_rf_schedule_lock(net->bsc_data->rf_ctrl,
+			locked == 1 ? '0' : '1');
+
 	cmd->reply = talloc_asprintf(cmd, "%u", locked);
 	if (!cmd->reply) {
 		cmd->reply = "OOM.";