[U-Boot] imx: add lowlevel init for ARM64

[sbabic at denx.de]

> Sometimes we met SERROR, but only to catch it when Linux boots up.
> Let's enable catching in U-Boot to catch it ealier and ease debug.
> 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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