Add dun APN for Telstra to apns-full-conf.xml

Test: Verified from logs without this change no dun APN is available,
with it it is.
Bug: 63564491
Bug: 69988299
Change-Id: Id3970e6444054ec0a7ac5cbb5c0f8a91788ea74d
(cherry picked from commit 3926d095a1d7402be380465bb067a089f6c4e5b6)
diff --git a/apns-full-conf.xml b/apns-full-conf.xml
index e47da0d..e6ca051 100644
--- a/apns-full-conf.xml
+++ b/apns-full-conf.xml
@@ -26361,6 +26361,13 @@
       mmsport="80"
   />
 
+  <apn carrier="Telstra Tethering"
+       mcc="505"
+       mnc="01"
+       apn="telstra.internet"
+       type="dun"
+  />
+
   <apn carrier="Optus Yes Internet"
       mcc="505"
       mnc="02"