src: include new file osmocom/vty/misc.h for vty_out_rate_ctr_group()

This uses the new include file for vty_out_rate_ctr_group() which
available in libosmocore.
diff --git a/openbsc/src/libgb/gprs_bssgp_vty.c b/openbsc/src/libgb/gprs_bssgp_vty.c
index 720c221..a0d74ac 100644
--- a/openbsc/src/libgb/gprs_bssgp_vty.c
+++ b/openbsc/src/libgb/gprs_bssgp_vty.c
@@ -42,6 +42,7 @@
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/logging.h>
 #include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/misc.h>
 
 /* FIXME: this should go to some common file as it is copied
  * in vty_interface.c of the BSC */