vty: Print the state of all GPRS OML objects in show bts

For debugging GB-proxy/IPA issues it is nice to see the state of
the OML objects.
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index 0875e1a..9e2c721 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -284,6 +284,14 @@
 	net_dump_nmstate(vty, &bts->mo.nm_state);
 	vty_out(vty, "  Site Mgr NM State: ");
 	net_dump_nmstate(vty, &bts->site_mgr.mo.nm_state);
+	vty_out(vty, "  GPRS NSE: ");
+	net_dump_nmstate(vty, &bts->gprs.nse.mo.nm_state);
+	vty_out(vty, "  GPRS CELL: ");
+	net_dump_nmstate(vty, &bts->gprs.cell.mo.nm_state);
+	vty_out(vty, "  GPRS NSVC0: ");
+	net_dump_nmstate(vty, &bts->gprs.nsvc[0].mo.nm_state);
+	vty_out(vty, "  GPRS NSVC1: ");
+	net_dump_nmstate(vty, &bts->gprs.nsvc[1].mo.nm_state);
 	vty_out(vty, "  Paging: %u pending requests, %u free slots%s",
 		paging_pending_requests_nr(bts),
 		bts->paging.available_slots, VTY_NEWLINE);