Move to Android-specific NTP pool.

Use "2.android.pool.ntp.org" since it returns both IPv4 and IPv6
addresses.  Verified that NTP client works correctly on both.

Change-Id: I0187ef4a6d3b353cfcc77957b1303ca01c67cbe9
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index e80e30a..31aa8d5 100755
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -817,7 +817,7 @@
     <bool name="config_allowActionMenuItemTextWithIcon">false</bool>
 
     <!-- Remote server that can provide NTP responses. -->
-    <string translatable="false" name="config_ntpServer">pool.ntp.org</string>
+    <string translatable="false" name="config_ntpServer">2.android.pool.ntp.org</string>
     <!-- Timeout to wait for NTP server response. -->
     <integer name="config_ntpTimeout">20000</integer>