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/gprs/gb_proxy_main.c b/openbsc/src/gprs/gb_proxy_main.c
index 45b45a4..f82fb5b 100644
--- a/openbsc/src/gprs/gb_proxy_main.c
+++ b/openbsc/src/gprs/gb_proxy_main.c
@@ -36,6 +36,7 @@
 #include <osmocom/core/talloc.h>
 #include <osmocom/core/select.h>
 #include <osmocom/core/rate_ctr.h>
+#include <osmocom/core/stats.h>
 
 #include <osmocom/gprs/gprs_ns.h>
 #include <osmocom/gprs/gprs_bssgp.h>
@@ -48,6 +49,7 @@
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/logging.h>
+#include <osmocom/vty/stats.h>
 #include <osmocom/vty/ports.h>
 
 #include "../../bscconfig.h"
@@ -242,11 +244,13 @@
 	vty_info.copyright = openbsc_copyright;
 	vty_init(&vty_info);
 	logging_vty_add_cmds(&gprs_log_info);
+	osmo_stats_vty_add_cmds(&gprs_log_info);
 	gbproxy_vty_init();
 
 	handle_options(argc, argv);
 
 	rate_ctr_init(tall_bsc_ctx);
+	osmo_stats_init(tall_bsc_ctx);
 
 	rc = telnet_init(tall_bsc_ctx, &dummy_network, OSMO_VTY_PORT_GBPROXY);
 	if (rc < 0)