Remove AT&T IMS APN for Carrier Validation

bug: 22859364
Change-Id: Ia8ce47386b0d52cea03f45cff199eb4fd4e5e62c
diff --git a/etc/apns-full-conf.xml b/etc/apns-full-conf.xml
index 511a637..21a10be 100755
--- a/etc/apns-full-conf.xml
+++ b/etc/apns-full-conf.xml
@@ -9451,15 +9451,6 @@
       type="default,supl,mms"
   />
 
- <apn carrier="ATT IMS"
-      mcc="310"
-      mnc="410"
-      apn="ims"
-      type="ims"
-      modem_cognitive="true"
-      protocol="IPV4V6"
-  />
-
   <apn carrier="Defense Mobile"
       mcc="310"
       mnc="410"