[ARM] Include asm/hardware.h instead of asm/arch/hardware.h

Rationalise hardware.h include.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index a1468d7..38d7ebf 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -26,7 +26,7 @@
  */
 
 #include <linux/init.h>
-#include <asm/arch/hardware.h>
+#include <asm/hardware.h>
 #include <asm/arch/dmtimer.h>
 #include <asm/io.h>
 #include <asm/arch/irqs.h>