wandboard: Add board revision detection support
There are two revisions of wandboard: version B1 and C1. Add the revision detection support, so that the correct dtb file can be automatically loaded. Based on the patch from Richard Hu <hakahu@gmail.com>. Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com> Reviewed-by: NStefano Babic <sbabic@denx.de> Tested-By: NVagrant Cascadian <vagrant@aikidev.net>
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