system_server allow to add batteryproperties_service

BatteryService now serves batteryproperties_service
(previously served by healthd) to allow BatteryManager
to continue to work.

Test: boots (BatteryService correctly starts up)

Bug: 63702641
Change-Id: If5c4c82d58c960c966b03afa3fc7902cda04222b
diff --git a/private/system_server.te b/private/system_server.te
index 290dded..727e8cd 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -588,6 +588,8 @@
 allow system_server vold_service:service_manager find;
 allow system_server wificond_service:service_manager find;
 
+add_service(system_server, batteryproperties_service)
+
 allow system_server keystore:keystore_key {
 	get_state
 	get