[meta-xilinx] Some fixes for meta-xilinx

[Sipke Vriend]

Hi Philip,

>
>On Wednesday, 21 August 2013 5:37 AM, Philip Balister wrote
>
>I've got some fixes here in case people are having trouble with
>meta-xilinx and master. I'd like to see the patch with the machine
>overrides go into meta-xilinx, without them, there are clashed with
>other bsp's using linux-yocto_3.8.
>

Thanks. Will test and commit.

>The device generation fix is wrong, but it does let the zedbaord kernel
>build succeed.
>

Working on it.

>https://github.com/balister/meta-xilinx/commits/philip-work
>
>Philip
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