ACPI: APEI: Remove a useless include

This file does not use rcu, so there is no point in including
<linux/rculist.h>.

So just remove it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/apei/apei-base.c

@@ -25,7 +25,6 @@
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/kref.h>
-#include <linux/rculist.h>
 #include <linux/interrupt.h>
 #include <linux/debugfs.h>
 #include <acpi/apei.h>