Allows APN to be unthrottled through an indication

* Exposed new radio indication that can unthrottle an APN

Test: N/a
Bug: 167434852
Change-Id: Ic7f0aac140049feac08902458d797388a807bab0
diff --git a/radio/1.6/vts/functional/radio_indication.cpp b/radio/1.6/vts/functional/radio_indication.cpp
index 57ee873..b353c82 100644
--- a/radio/1.6/vts/functional/radio_indication.cpp
+++ b/radio/1.6/vts/functional/radio_indication.cpp
@@ -25,6 +25,11 @@
     return Void();
 }
 
+Return<void> RadioIndication_v1_6::unthrottleApn(RadioIndicationType /*type*/,
+                                                 const ::android::hardware::hidl_string& /*apn*/) {
+    return Void();
+}
+
 /* 1.5 Apis */
 Return<void> RadioIndication_v1_6::uiccApplicationsEnablementChanged(RadioIndicationType /*type*/,
                                                                      bool /*enabled*/) {