Add org.nemomobile.compositor D-Bus config

The compositor D-Bus service is needed for handling state synchronization
between mce and ui during display power up / down. It can in theory be
implemented by any user process, but the D-Bus configuration is provided
from jolla specific jolla-actdead-charging package.

Include the compositor D-Bus in to mce package so that it can be removed
from jolla-actdead-charging package.

[mce] Add org.nemomobile.compositor D-Bus config. Contributes to JB#29194

mce.conf

@@ -146,4 +146,13 @@
 		       send_interface="com.nokia.mce.request"
 		       send_member="notification_end_req"/>
 	</policy>
+
+	<!-- MCE expects some user process to provide compositor
+	     D-Bus service. Normally it is lipstick, but it can
+	     be something else too like act dead charging ui -->
+	<policy context="default">
+		<allow own="org.nemomobile.compositor" />
+		<allow send_destination="org.nemomobile.compositor" />
+	</policy>
+
 </busconfig>