[dbus] Add configuration for get_suspend_stats method call. Fixes MER…

…#1398

The method call is supposed to be available for all proceces, but the
configuration entry making it so is missing.

Allow all processes to call get_suspend_stats D-Bus method,

mce.conf

@@ -145,6 +145,10 @@
 		<allow send_destination="com.nokia.mce"
 		       send_interface="com.nokia.mce.request"
 		       send_member="notification_end_req"/>
+
+		<allow send_destination="com.nokia.mce"
+		       send_interface="com.nokia.mce.request"
+		       send_member="get_suspend_stats"/>
 	</policy>
 
 	<!-- MCE expects some user process to provide compositor