imx: mxs: reimplement get_cpu_rev
Rewrite get_cpu_rev, from "static const char *get_cpu_rev(void)" to "u32 get_cpu_rev(void)". To align with get_cpu_rev of other i.MXes. Also write get_imx_type to replace get_cpu_type, since we have macro named get_cpu_type. 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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