apn: Update the Ultra Mobile apn

Add dun apn type to fix hotspot/tethering.
Also update according to https://www.ultramobile.com/data-settings/

BUGBASH-2371

Change-Id: I202cc7be26403d774e8694dd4386391d3576ea66
(cherry picked from commit 367ca28f8206a1e5be8655fb2f1c2e4972d7e8e3
diff --git a/prebuilt/common/etc/apns-conf.xml b/prebuilt/common/etc/apns-conf.xml
index bc21f19..c2b1d51 100644
--- a/prebuilt/common/etc/apns-conf.xml
+++ b/prebuilt/common/etc/apns-conf.xml
@@ -1394,7 +1394,7 @@
   <apn carrier="Net10" mcc="310" mnc="260" apn="wap.tracfone" port="8080" mmsc="http://mms.tracfone.com" type="default,mms,supl" />
   <apn carrier="Family Mobile" mcc="310" mnc="260" apn="web.omwtoday.com" port="" mmsc="http://wirelessfour.mmsmvno.com/mms/wapenc" mvno_type="gid" mvno_match_data="4d4b" type="default,mms,supl" />
   <apn carrier="I-Wireless" mcc="310" mnc="260" apn="i2.iwireless.com" proxy="" port="" user="" password="" mmsc="http://mmsc.iwireless.datonair.net:6672" type="default,supl,mms" />
-  <apn carrier="Ultra" mcc="310" mnc="260" apn="wholesale" port="" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" mvno_type="gid" mvno_match_data="6132" type="default,mms,supl" />
+  <apn carrier="Ultra" mcc="310" mnc="260" apn="Wholesale" port="8080" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" mvno_type="gid" mvno_match_data="6132" type="default,mms,supl,dun" />
   <apn carrier="GIV Mobile" mcc="310" mnc="260" apn="wholesale" port="" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" type="default,mms,supl" />
   <apn carrier="ROK mobile" mcc="310" mnc="260" apn="wholesale" port="" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" type="default,mms,supl,admin" />
   <apn carrier="UVA Wireless" mcc="310" mnc="260" apn="wholesale" port="" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" type="default,mms,supl,admin" />