Telecomm service does not use cleartext network traffic.

This declares to the platform and tools that this service does not use
cleartext network traffic. The platform and tools will be blocking
(on best effort basis) attempts to use such traffic by this service.
For example, attempts to use HTTP (rather than HTTPS) will be blocked.

Bug: 19215516
Change-Id: I443fdc64e5e9bbfb51fd2649c7c6efd5fc000d9f
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 92b1600..ac3799f 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -68,7 +68,8 @@
             android:icon="@mipmap/ic_launcher_phone"
             android:allowBackup="false"
             android:supportsRtl="true"
-            android:process="system">
+            android:process="system"
+            android:usesCleartextTraffic="false">
 
         <!-- CALL vs CALL_PRIVILEGED vs CALL_EMERGENCY
              We have three different intents through which a call can be initiated each with its