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/system_server.te b/private/system_server.te
index 68792e8..d2b4091 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -277,6 +277,7 @@
 binder_call(system_server, storaged)
 binder_call(system_server, update_engine)
 binder_call(system_server, vold)
+binder_call(system_server, logd)
 binder_call(system_server, wificond)
 binder_call(system_server, wpantund)
 binder_service(system_server)
@@ -881,6 +882,7 @@
 allow system_server update_engine_service:service_manager find;
 allow system_server vold_service:service_manager find;
 allow system_server wifinl80211_service:service_manager find;
+allow system_server logd_service:service_manager find;
 userdebug_or_eng(`
   allow system_server profcollectd_service:service_manager find;
 ')