stats: Enable stats for sgsn, gbproxy, nitb, bsc, nat

This commit initialises and enables the stats subsystem for the given
binaries.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index f8ef833..24bae97 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -24,6 +24,7 @@
 #include <osmocom/vty/buffer.h>
 #include <osmocom/vty/vty.h>
 #include <osmocom/vty/logging.h>
+#include <osmocom/vty/stats.h>
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/misc.h>
 
@@ -3737,6 +3738,7 @@
 	install_element_ve(&show_paging_group_cmd);
 
 	logging_vty_add_cmds(cat);
+	osmo_stats_vty_add_cmds();
 
 	install_element(CONFIG_NODE, &cfg_net_cmd);
 	install_node(&net_node, config_write_net);