[U-Boot] Marvell SheevaPlug v2013.04 Refresh (ask for review)

Hi,

I have started to rework all the MVSDIO driver, and some more enhancements, to make a cool updated and workable SheevaPlug. I have take the v2013.04 denx uBoot to base my patchs.

If you can take a look inside and give me needed feedback.

I want to precise that I do not easily practice GIT features.

Regards, Gérald