add USSD handlers to enable/disable 2G access

Change-Id: Ib266bf6ebc7692362a443efbf9b4ae69aee671d6
diff --git a/doc/examples/osmo-hlr.cfg b/doc/examples/osmo-hlr.cfg
index 58166f7..dc683d9 100644
--- a/doc/examples/osmo-hlr.cfg
+++ b/doc/examples/osmo-hlr.cfg
@@ -25,5 +25,7 @@
  ussd route prefix *#100# internal own-msisdn
  ussd route prefix *#101# internal own-imsi
  ussd route prefix *#102# internal get-ran
+ ussd route prefix *#200# internal gsm-off
+ ussd route prefix *#201# internal gsm-on
  ussd route prefix *#300# internal umts-off
  ussd route prefix *#301# internal umts-on