watchdog: OMAP: fixup for ARM multiplatform support

Recent changes to the omap_wdt.c removed the dependencies to
the core omap code, but forgot to remove mach/hardware.h.

We cannot include any plat headers with multiplatform
support enabled.

cc: Wim Van Sebroeck <wim@iguana.be>
cc: linux-watchdog@vger.kernel.org
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/watchdog/omap_wdt.c

@@ -45,8 +45,6 @@
 #include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
-#include <mach/hardware.h>
-
 #include <linux/platform_data/omap-wd-timer.h>
 
 #include "omap_wdt.h"