Add rules for Lights AIDL HAL

Test: manual; yukawa and cuttlefish; adb logcat | grep -i avc
Bug: 142230898
Change-Id: I9f576511d1fc77c5f0ad3cf1b96b038b301773d7
diff --git a/private/blank_screen.te b/private/blank_screen.te
index 51310d1..69dd7e6 100644
--- a/private/blank_screen.te
+++ b/private/blank_screen.te
@@ -4,3 +4,5 @@
 init_daemon_domain(blank_screen)
 
 hal_client_domain(blank_screen, hal_light)
+
+allow blank_screen hal_light_service:service_manager find;