Some fixes and improvements while working with the Chumby

[Sascha Hauer]

On Fri, Apr 26, 2013 at 11:31:46AM +0200, Juergen Beisert wrote:
> Below a list of some small patches for the MXS MCI driver and the MCI core.
> Comments are welcome.

Squashed 1/6 into the commit breaking it, applied 2/6 to master,
3-5/6 to next.

Sascha

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