x86-64, NUMA: Put dummy_numa_init() in the init section

dummy_numa_init() is used only during system boot.  Put it in .init
like other NUMA init functions.

- tj: Description update.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

arch/x86/mm/numa_64.c

@@ -899,7 +899,7 @@ static bool __init numa_emulation(void)
 }
 #endif /* CONFIG_NUMA_EMU */
 
-static int dummy_numa_init(void)
+static int __init dummy_numa_init(void)
 {
 	printk(KERN_INFO "%s\n",
 	       numa_off ? "NUMA turned off" : "No NUMA configuration found");