Allow blank_screen to make binder calls to the servicemanager

blank_screen can not find and use the lights HAL if it cannot use the servicemanager. This
broke turning off the display during shutdown.

Change-Id: I6aff1cb71f805637abc79493ba2574143c5cf7cf
Test: adb root; adb shell setenforce 1; adb shell setprop ctl.start blank_screen
Test: adb logcat -b all | grep 'denied'
Bug: 151363454
diff --git a/private/blank_screen.te b/private/blank_screen.te
index 69dd7e6..20d50cc 100644
--- a/private/blank_screen.te
+++ b/private/blank_screen.te
@@ -3,6 +3,5 @@
 
 init_daemon_domain(blank_screen)
 
+# hal_light_client has access to hal_light_server
 hal_client_domain(blank_screen, hal_light)
-
-allow blank_screen hal_light_service:service_manager find;