[PATCH 4/5] imx: spl: Remove ifdefs in spl_mmc_boot_mode()

[sbabic at denx.de]

> It is hard to read code which contains nested ifdef blocks.  Replace
> them with normal if-blocks and the IS_ENABLED() macro.  This is not only
> more readable but also helps as both arms are validated by the compiler
> in all cases.
> Signed-off-by: Harald Seiler <hws at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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