Added a broadcast intent for clients to listen for country changes

Added a broadcast intent ACTION_NETWORK_COUNTRY_CHANGED for clients
to listen for network country code changes. The same value can be
retrieved from TelephonyManager.getNetworkCountryIso().

Test: Manual + unit tests
Bug: 122900588
Change-Id: I91bc3d9b08a01c8332da35cdac5aea435b4f7234
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 20a2e39..aa12d12 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -92,6 +92,7 @@
     <protected-broadcast android:name= "android.telephony.action.SIM_SLOT_STATUS_CHANGED" />
     <protected-broadcast android:name= "android.telephony.action.SUBSCRIPTION_CARRIER_IDENTITY_CHANGED" />
     <protected-broadcast android:name= "android.telephony.action.SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED" />
+    <protected-broadcast android:name= "android.telephony.action.NETWORK_COUNTRY_CHANGED" />
 
     <uses-permission android:name="android.permission.BROADCAST_STICKY" />
     <uses-permission android:name="android.permission.CALL_PHONE" />