(Telecom-system Part 3.b) Change telecom service context to "system"

Bug: 18112269
Change-Id: I801a3ecb42a2636b15612ff19a55150d06786363
diff --git a/service_contexts b/service_contexts
index 8585fcf..767d7db 100644
--- a/service_contexts
+++ b/service_contexts
@@ -102,7 +102,7 @@
 statusbar                                 u:object_r:system_server_service:s0
 SurfaceFlinger                            u:object_r:surfaceflinger_service:s0
 task                                      u:object_r:system_server_service:s0
-telecom                                   u:object_r:radio_service:s0
+telecom                                   u:object_r:system_server_service:s0
 telephony.registry                        u:object_r:system_server_service:s0
 textservices                              u:object_r:system_server_service:s0
 trust                                     u:object_r:system_server_service:s0