[PATCH V3 2/9] cpu: sandbox: support is_current

[sbabic at denx.de]

> Support querying whether U-Boot is running on current cpu
> Reviewed-by: Simon Glass <sjg at chromium.org>
> 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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