[Thread] limit ot-daemon socket to ot-ctl

It's better to explicitly disallow access to ot-daemon from other than
ot-ctl.

Bug: 323502847
Change-Id: Ic46ad4e8f3a1d21bbfc9f4f01e6a692aafcdb815
diff --git a/private/file_contexts b/private/file_contexts
index b9d661a..caf0725 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -288,6 +288,7 @@
 /system/bin/vold	u:object_r:vold_exec:s0
 /system/bin/netd	u:object_r:netd_exec:s0
 /system/bin/wificond	u:object_r:wificond_exec:s0
+/system/bin/ot-ctl      u:object_r:ot_ctl_exec:s0
 /system/bin/audioserver	u:object_r:audioserver_exec:s0
 /system/bin/mediadrmserver	u:object_r:mediadrmserver_exec:s0
 /system/bin/mediaserver	u:object_r:mediaserver_exec:s0