uboot ramdisk image support for arm

[Michele Dionisio]

Hi, I have add support for uboot ramdisk support in the patch attached.

the new features is implemented in:
kexec/arch/arm/kexec-uImage-arm.c
kexec/arch/arm/kexec-zImage-arm.c

but there is also a fix in
kexec/kexec-uImage.c where there is a endianes bug.

If someone can review the patch I think that it can be usefull to be 
added in the next version.

Regards.
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