add sepolicy rules for Thread network

bug: 257371610
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0fd52fd521b8167b0ec8836dac3765a16fd6863b)
Merged-In: I2c90639f4baecb010230b3aa60f2f09c0ddd9e4f
Change-Id: I2c90639f4baecb010230b3aa60f2f09c0ddd9e4f
diff --git a/apex/com.android.threadnetwork-file_contexts b/apex/com.android.threadnetwork-file_contexts
new file mode 100644
index 0000000..1aabee9
--- /dev/null
+++ b/apex/com.android.threadnetwork-file_contexts
@@ -0,0 +1,4 @@
+(/.*)?                         u:object_r:system_file:s0
+/bin/otbr-agent                u:object_r:ot_daemon_exec:s0
+/bin/ot-ctl                    u:object_r:ot_ctl_exec:s0
+/bin/ot-rcp                    u:object_r:ot_rcp_exec:s0