uboot-imx

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: Simon Kagstrom <simon.kagstrom@netinsight.net>
Acked-by: Stefan Roese <sr@denx.de>