[U-Boot] [PATCH v2] MX51: mx51evk: Use struct to access SRSR register instead of offset

[Detlev Zundel]

Hi Fabio,

> Use struct to access SRSR register instead of offset. While at it mask 
> the 7 bits of SRSR for correctness.
>
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>

The SRSR is a MX51 register and thus not board specific.  Can we please
move this reset cause detection into common mx51 code so other boards
will profit from it also?

Thanks
  Detlev

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