src: Drop unused 'include <arch/ioapic.h>'

Change-Id: I1341f90230f318ac81a4aea24872ff272adad1eb
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31856
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/aopen/dxplplusu/acpi/i82801db.asl b/src/mainboard/aopen/dxplplusu/acpi/i82801db.asl
index bd6b286..4be964d 100644
--- a/src/mainboard/aopen/dxplplusu/acpi/i82801db.asl
+++ b/src/mainboard/aopen/dxplplusu/acpi/i82801db.asl
@@ -13,6 +13,8 @@
  * GNU General Public License for more details.
  */
 
+#include <arch/ioapic.h>
+
 Device (USB0)
 {
 	Name (_ADR, 0x001D0000)