Use "IMS" apn name instead of "VZWIMS" for Verizon ims type

Use "IMS" apn name instead of "VZWIMS" for Verizon ims type

Bug: 121150347
Test: live network verified pass
Change-Id: Ib34fec5681b9918363f235c4a342fc68c0ba630e
Merged-In: I6d03cdac317d135f1813e9052acb31754972ba6a

etc/apns-full-conf.xml

@@ -502,7 +502,7 @@
       carrier_id = "1839"
       mcc="204"
       mnc="04"
-      apn="VZWIMS"
+      apn="IMS"
       type="ims,ia"
       protocol="IPV4V6"
       roaming_protocol="IPV4V6"
@@ -518,7 +518,7 @@
       carrier_id = "1839"
       mcc="204"
       mnc="04"
-      apn="VZWIMS"
+      apn="IMS"
       type="ims,ia"
       protocol="IPV4V6"
       roaming_protocol="IPV4V6"
@@ -14474,7 +14474,7 @@
       carrier_id = "1839"
       mcc="311"
       mnc="480"
-      apn="VZWIMS"
+      apn="IMS"
       type="ims,ia"
       protocol="IPV4V6"
       roaming_protocol="IPV4V6"