init: add interface to setsched on init

Signed-off-by: Kenton Groombridge <me@concord.sh>

policy/modules/system/init.if

@@ -922,6 +922,24 @@ interface(`init_sigchld',`
 	allow $1 init_t:process sigchld;
 ')
 
+########################################
+## <summary>
+##	Set the nice level of init.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed access.
+##	</summary>
+## </param>
+#
+interface(`init_setsched',`
+	gen_require(`
+		type init_t;
+	')
+
+	allow $1 init_t:process setsched;
+')
+
 ########################################
 ## <summary>
 ##	Connect to init with a unix socket.