avr32: Implement {read,write}[bwl]_be

#define readw_relaxed			readw

#define readl_relaxed			readl

#define readb_be			__raw_readb

#define readw_be			__raw_readw

#define readl_be			__raw_readl

#define writeb_be			__raw_writeb

#define writew_be			__raw_writew

#define writel_be			__raw_writel

#define __BUILD_MEMORY_STRING(bwl, type)				\

static inline void writes##bwl(volatile void __iomem *addr,		\

			       const void *data, unsigned int count)	\