[U-Boot] imx8: cpu: restrict checking ROM passover info for revA

[sbabic at denx.de]

> Passover info only for revA.
> move get_cpu_rev out of CONFIG_CPU to avoid build failure when using
> get_cpu_rev in SPL.
> Add a CONFIG_SPL_BUILD for passover usage, no need to execute it again
> in normal U-Boot stage. Also if still checking passover info in normal
> U-Boot stage, need to make the passover code executed after
> arch_cpu_init_dm.
> So to make it easy and clean, only execute the code for SPL stage.
> Signed-off-by: Peng Fan <peng.fan at nxp.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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