Add unaligned.h for arm

This patch adds unaligned.h for ARM (needed to build with LZO
compression). The file is taken from the linux kernel, but includes
u-boot headers instead.
Signed-off-by: NSimon Kagstrom <simon.kagstrom@netinsight.net>
Acked-by: NStefan Roese <sr@denx.de>

include/asm-arm/unaligned.h

+#ifndef _ASM_ARM_UNALIGNED_H
+#define _ASM_ARM_UNALIGNED_H
+
+#include <linux/unaligned/access_ok.h>
+#include <linux/unaligned/generic.h>
+
+/*
+ * Select endianness
+ */
+#ifndef __ARMEB__
+#define get_unaligned	__get_unaligned_le
+#define put_unaligned	__put_unaligned_le
+#else
+#define get_unaligned	__get_unaligned_be
+#define put_unaligned	__put_unaligned_be
+#endif
+
+#endif /* _ASM_ARM_UNALIGNED_H */