SS/USSD: implement an IUSE for getting RAN type(s)

Change-Id: I8d95413784b039df50a4cdcac49289060f0414c6
diff --git a/src/hlr_vty.c b/src/hlr_vty.c
index f7c5bc8..d2f5a2e 100644
--- a/src/hlr_vty.c
+++ b/src/hlr_vty.c
@@ -156,10 +156,11 @@
 #define UROUTE_STR "Routing Configuration\n"
 #define PREFIX_STR "Prefix-Matching Route\n" "USSD Prefix\n"
 
-#define INT_CHOICE "(own-msisdn|own-imsi)"
+#define INT_CHOICE "(own-msisdn|own-imsi|get-ran)"
 #define INT_STR "Internal USSD Handler\n" \
 		"Respond with subscribers' own MSISDN\n" \
-		"Respond with subscribers' own IMSI\n"
+		"Respond with subscribers' own IMSI\n" \
+		"Respond with available RAN types\n"
 
 #define EXT_STR "External USSD Handler\n" \
 		"Name of External USSD Handler (IPA CCM ID)\n"