Add permission whitelist for EmergencyInfo app.

This is the "Emergency Info" screen available from the lock screen.
It requires the CALL_PRIVILEGED permission in order for it to be able to
place emergency calls.  This can occur if a user adds an emergency number
to their emergency contacts.

Test: make checkbuild
Bug: 76086838
Change-Id: I76e8318c5c05bbbbdf02d2c6951f742c3bd67ea6

data/etc/privapp-permissions-platform.xml

@@ -56,6 +56,8 @@ applications that come with the platform
     </privapp-permissions>
 
     <privapp-permissions package="com.android.emergency">
+        <!-- Required to place emergency calls from emergency info screen. -->
+        <permission name="android.permission.CALL_PRIVILEGED"/>
         <permission name="android.permission.MANAGE_USERS"/>
     </privapp-permissions>