Provide last known cell id for emergency call

Provide last known cell id to connection service
for emergency calls.

Bug: 198533763
Test: unit test
Change-Id: I219ebab40f58dfa9bf3c8c294fdcca86aa5fd3a7
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6b4a19c..5050ea3 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -242,6 +242,10 @@
     <!-- Needed to listen to changes in projection state. -->
     <uses-permission android:name="android.permission.READ_PROJECTION_STATE"/>
 
+    <permission android:name="com.android.phone.permission.ACCESS_LAST_KNOWN_CELL_ID"
+                android:label="Access last known cell identity."
+                android:protectionLevel="signature"/>
+
     <application android:name="PhoneApp"
             android:persistent="true"
             android:label="@string/phoneAppLabel"