watchdogd: Add sepolicy for platform watchdog daemon

Bug: 238701471
Change-Id: I4eae2c1ea9b2a77df9b2064ab42108584fe61b8c
diff --git a/gs_watchdogd/file_contexts b/gs_watchdogd/file_contexts
new file mode 100644
index 0000000..22dd02b
--- /dev/null
+++ b/gs_watchdogd/file_contexts
@@ -0,0 +1,5 @@
+# Platform watchdogd
+/system_ext/bin/gs_watchdogd            u:object_r:gs_watchdogd_exec:s0
+
+# Devices
+/dev/watchdog[0-9]                      u:object_r:watchdog_device:s0