drivers: base: Use __printf markup to silence compiler

Silence warnings (triggered at W=1) by adding relevant __printf
attributes.

  drivers/base/cpu.c:432:2: warning: function '__cpu_device_create' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/cpu.c

@@ -409,6 +409,7 @@ static void device_create_release(struct device *dev)
 	kfree(dev);
 }
 
+__printf(4, 0)
 static struct device *
 __cpu_device_create(struct device *parent, void *drvdata,
 		    const struct attribute_group **groups,