added T-Mobile MVNO Wholesale apn

Used by Ptel, Roam, Rok Mobile, Speed Talk, Spot Mobile, Ultra
Mobile, University Mobile

Requested here: https://jira.cyanogenmod.org/browse/CYAN-5613

Change-Id: Ib3e3d35664b804d5ce39d7f8bba01163d2cf9e89

prebuilt/common/etc/apns-conf.xml

@@ -706,6 +706,7 @@
   <apn carrier="Simple" mcc="310" mnc="260" apn="simple" mmsc="http://smpl.mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" />
   <apn carrier="StraightTalk T-Mobile" mcc="310" mnc="260" apn="wap.tracfone" port="8080" mmsc="http://mms.tracfone.com" type="default,supl,mms" />
   <apn carrier="Walmart Family Mobile" mcc="310" mnc="260" apn="web.omwtoday.com" mmsproxy="216.155.165.50" mmsport="8080" mmsc="http://wirelessfour.mmsmvno.com/mms/wapenc" type="default,supl,mms" />
+  <apn carrier="Wholesale" mcc="310" mnc="260" apn="wholesale" mmsc="http://wholesale.mmsmvno.com/mms/wapenc" type="default,supl,mms" />
   <apn carrier="T-Mobile US 270" mcc="310" mnc="270" apn="epc.tmobile.com" user="none" password="none" server="*" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" />
   <apn carrier="T-Mobile US 310" mcc="310" mnc="310" apn="epc.tmobile.com" user="none" password="none" server="*" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" />
   <apn carrier="Cingular 380 ATT" mcc="310" mnc="380" apn="proxy" proxy="wireless.cingular.com" port="80" mmsc="http://mmsc.cingular.com/" mmsproxy="wireless.cingular.com" type="default,supl,mms" />