Fix mtd-utils bugs

[stanley.miao]

BTW, because ECCGETLAYOUT was added in 2.6.17, so these patches will 
break on
linux kernel prior to 2.6.17.

Stanley.

Stanley.Miao wrote:
> (Re-send it because the previous one don't have a subject.)
>
> During some BSP development process, I found some tools in mtd-utils
> contain legacy interfaces and it is not suitable with the current linux
> kernel. I post my patches here in case somebody else need them.
>
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