Some fixes for MPC5200 platforms

[Sascha Hauer]

On Fri, May 27, 2016 at 11:32:47AM +0200, Juergen Borleis wrote:
> Barebox for MPC5200 (PCM030 board for example) is currently broken. Below
> some fixes and improvemnts to make it boot/work again.
> 
> Comments are welcome.

Applied, thanks

Sascha


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