Define rcs to be a radio_service

RcsService will die continously without the setting.

Bug: 123325711
Test: boot aosp_arm64_ab-userdebug on a blueline device
Change-Id: Ic140cb3e6466428bf62f0065c78aaf16f957f4d5
diff --git a/private/service_contexts b/private/service_contexts
index ba06542..82abfbc 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -151,6 +151,7 @@
 radio.phonesubinfo                        u:object_r:radio_service:s0
 radio.phone                               u:object_r:radio_service:s0
 radio.sms                                 u:object_r:radio_service:s0
+rcs                                       u:object_r:radio_service:s0
 recovery                                  u:object_r:recovery_service:s0
 restrictions                              u:object_r:restrictions_service:s0
 role                                      u:object_r:role_service:s0