[PATCH] freescale: imx8mm_evk: Use IS_ENABLED instead of #ifdef

[sbabic at denx.de]

> Use IS_ENABLED(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG) to make the code
> more readable and fix checkpatch.pl warning
> Signed-off-by: Tommaso Merciai <tomm.merciai at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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