mx31ads: Fix build for missing mx31.h

Several of the macros in mx31ads.h depend on mx31.h which is no longer
included in quite so many standard headers as it once was. Include it
directly so we can build.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/plat-mxc/include/mach/board-mx31ads.h

@@ -11,6 +11,8 @@
 #ifndef __ASM_ARCH_MXC_BOARD_MX31ADS_H__
 #define __ASM_ARCH_MXC_BOARD_MX31ADS_H__
 
+#include <mach/hardware.h>
+
 /* Base address of PBC controller */
 #define PBC_BASE_ADDRESS        IO_ADDRESS(CS4_BASE_ADDR)
 /* Offsets for the PBC Controller register */