Added APN for Tal Iceland, ref CYAN-5026.
Note that I am not on that network myself so I have not been able to verify the settings. However, they are taken from the official support site.

Change-Id: I8b803f5af6e6c307f4ce85f1e20bf75050bcf1be
diff --git a/prebuilt/common/etc/apns-conf.xml b/prebuilt/common/etc/apns-conf.xml
index 4c3a601..6716eed 100644
--- a/prebuilt/common/etc/apns-conf.xml
+++ b/prebuilt/common/etc/apns-conf.xml
@@ -517,6 +517,7 @@
   <apn carrier="Vodafone MMS" mcc="274" mnc="02" apn="mms.gprs.is" mmsc="http://mmsc.vodafone.is" mmsproxy="10.22.0.10" mmsport="8080" type="mms" />
   <apn carrier="MMS Nova" mcc="274" mnc="11" apn="mms.nova.is" mmsc="http://mmsc.nova.is" mmsproxy="10.10.2.60" mmsport="8080" type="mms" />
   <apn carrier="Net Nova" mcc="274" mnc="11" apn="net.nova.is" type="default,supl" />
+  <apn carrier="Tal" mcc="274" mnc="12" apn="internet.tal.is" mmsc="http://mms.tal.is/servlets/mms" mmsproxy="213.167.138.210" mmsport="8080" type="default,supl,mms" />
   <apn carrier="Vodafone AL" mcc="276" mnc="02" apn="Twa" type="default,supl" />
   <apn carrier="Vodafone AL MMS" mcc="276" mnc="02" apn="vfalmms" mmsc="http://mmsc.vodafone.al" mmsproxy="10.0.9.2" mmsport="8080" type="mms" />
   <apn carrier="Cytamobile MMS" mcc="280" mnc="01" apn="cytamobile" user="user" password="pass" mmsc="http://mmsc.cyta.com.cy" mmsproxy="212.031.096.161" mmsport="9201" type="mms" />