ARM: bcm283x: Repair wdog.h

Trivially fix the include check in wdog.h.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Tyler Baker <tyler.baker@linaro.org>

arch/arm/mach-bcm283x/include/mach/wdog.h

@@ -4,8 +4,8 @@
  * SPDX-License-Identifier:	GPL-2.0
  */
 
-#ifndef _BCM2835_TIMER_H
-#define _BCM2835_TIMER_H
+#ifndef _BCM2835_WDOG_H
+#define _BCM2835_WDOG_H
 
 #ifdef CONFIG_BCM2836
 #define BCM2835_WDOG_PHYSADDR			0x3f100000