arm: spl: fix include guard

cc: Tom Rini <trini@ti.com>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/arch/arm/include/asm/arch-keystone/spl.h b/arch/arm/include/asm/arch-keystone/spl.h
index 7012ea7..a7102d5 100644
--- a/arch/arm/include/asm/arch-keystone/spl.h
+++ b/arch/arm/include/asm/arch-keystone/spl.h
@@ -5,7 +5,7 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _ASM_ARCH_SPL_H_
-#define _ASM_SPL_H_
+#define _ASM_ARCH_SPL_H_
 
 #define BOOT_DEVICE_SPI        2