Add rttmanager in sepolicy's whitelist

Looks like system server doesn't let you start a service without
white listing anymore.

Bug: 16628456

Change-Id: I0f6df8fd2afa24f4a1758a90cb5f8e451e0edb6a

service_contexts

@@ -88,6 +88,7 @@ radio.phonesubinfo                        u:object_r:radio_service:s0
 radio.phone                               u:object_r:radio_service:s0
 radio.sms                                 u:object_r:radio_service:s0
 restrictions                              u:object_r:system_server_service:s0
+rttmanager                                u:object_r:system_server_service:s0
 samplingprofiler                          u:object_r:system_server_service:s0
 scheduling_policy                         u:object_r:system_server_service:s0
 search                                    u:object_r:system_server_service:s0