vty: use install_lib_element() and install_lib_element_ve()

See https://lists.osmocom.org/pipermail/openbsc/2020-October/013278.html.

Change-Id: Ic541126ffd4975daf87199abfafb465e2055e44f
Related: SYS#4937
diff --git a/src/gb/gprs_bssgp_vty.c b/src/gb/gprs_bssgp_vty.c
index 5dab94e..3dee18e 100644
--- a/src/gb/gprs_bssgp_vty.c
+++ b/src/gb/gprs_bssgp_vty.c
@@ -207,15 +207,15 @@
 
 int bssgp_vty_init(void)
 {
-	install_element_ve(&show_bssgp_cmd);
-	install_element_ve(&show_bssgp_stats_cmd);
-	install_element_ve(&show_bvc_cmd);
-	install_element_ve(&logging_fltr_bvc_cmd);
-	install_element_ve(&bvc_reset_cmd);
+	install_lib_element_ve(&show_bssgp_cmd);
+	install_lib_element_ve(&show_bssgp_stats_cmd);
+	install_lib_element_ve(&show_bvc_cmd);
+	install_lib_element_ve(&logging_fltr_bvc_cmd);
+	install_lib_element_ve(&bvc_reset_cmd);
 
-	install_element(CFG_LOG_NODE, &logging_fltr_bvc_cmd);
+	install_lib_element(CFG_LOG_NODE, &logging_fltr_bvc_cmd);
 
-	install_element(CONFIG_NODE, &cfg_bssgp_cmd);
+	install_lib_element(CONFIG_NODE, &cfg_bssgp_cmd);
 	install_node(&bssgp_node, config_write_bssgp);
 
 	return 0;