Add sepolicy for logd and logcat services

The logd binder service is on logd side.
The logcat binder service is on system_server side.
These two binder services facilitate the binder RPC
between logd and system_server.

Bug: 197901557
Test: manual
Change-Id: I5f08bbb44a88dc72302331ab11c7d54f94db16ac
diff --git a/private/service_contexts b/private/service_contexts
index bee400f..2e79abb 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -198,6 +198,8 @@
 location                                  u:object_r:location_service:s0
 location_time_zone_manager                u:object_r:location_time_zone_manager_service:s0
 lock_settings                             u:object_r:lock_settings_service:s0
+logcat                                    u:object_r:logcat_service:s0
+logd                                      u:object_r:logd_service:s0
 looper_stats                              u:object_r:looper_stats_service:s0
 lpdump_service                            u:object_r:lpdump_service:s0
 media.aaudio                              u:object_r:audioserver_service:s0