Rename service from ircs to ircsmessage

ircs is not specific enough. There will be multiple services in the
future with ircsmessage used specificially for  message store.

Test: compile, tests
Change-Id: Ia7d57e6900c733408be26d6520aa46c512229248
diff --git a/private/service_contexts b/private/service_contexts
index e21ba4f..7d6cb47 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -91,7 +91,7 @@
 ims                                       u:object_r:radio_service:s0
 imms                                      u:object_r:imms_service:s0
 ipsec                                     u:object_r:ipsec_service:s0
-ircs                                      u:object_r:radio_service:s0
+ircsmessage                               u:object_r:radio_service:s0
 iris                                      u:object_r:iris_service:s0
 isms_msim                                 u:object_r:radio_service:s0
 isms2                                     u:object_r:radio_service:s0