imx: mx31 use new formula for get_cpu_rev
Use new formula for get_cpu_rev, since we need to use this formula to do runtime check for all i.MXes. Signed-off-by: NPeng Fan <Peng.Fan@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Reviewed-by: NStefano Babic <sbabic@denx.de>
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