[U-Boot] [PATCH 31/34] imx: serial_mxc: use CONFIG_IS_ENABLED instead of ifdef

[sbabic at denx.de]

> Kconfig allows boards to configured with DM_SERIAL and still
> have SPL_DM_SERIAL disabled.  This patch changes the ifdef's
> to CONFIG_IS_ENABLED to allow the modes to differ between
> SPL and U-Boot.
> Signed-off-by: Adam Ford <aford173 at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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