[PATCH] mtd: nand: Fix typo in MXC Kconfig symbol description

[sbabic at denx.de]

> From: Haolin Li <li.haolin at qq.com>
> Trivial typo fix.
> Signed-off-by: Haolin Li <li.haolin at qq.com>
> Reviewed-by: Michal Simek <michal.simek at xilinx.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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