Add sepolicy for RebootReadinessDetector

Test: Builds
Bug: 161353402
Change-Id: I3778e00ee249f5ab1904737196b282de1d315846
diff --git a/private/service_contexts b/private/service_contexts
index f22e2fd..789d653 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -197,6 +197,7 @@
 radio.phone                               u:object_r:radio_service:s0
 radio.sms                                 u:object_r:radio_service:s0
 rcs                                       u:object_r:radio_service:s0
+reboot_readiness                          u:object_r:reboot_readiness_service:s0
 recovery                                  u:object_r:recovery_service:s0
 restrictions                              u:object_r:restrictions_service:s0
 role                                      u:object_r:role_service:s0