Move watchdogd out of init and into its own domain

Bug: 73660730
Test: watchdogd still runs
Change-Id: I31697c7c6fa2f7009731ff48c659af051838e42f
diff --git a/private/watchdogd.te b/private/watchdogd.te
index 36dd30f..91ece70 100644
--- a/private/watchdogd.te
+++ b/private/watchdogd.te
@@ -1 +1,3 @@
 typeattribute watchdogd coredomain;
+
+init_daemon_domain(watchdogd)