[PATCH v2] mmc: fsl_esdhc_imx: add wait_dat0() support

[sbabic at denx.de]

> From: Haibo Chen <haibo.chen at nxp.com>
> Add wait_dat0() support, upper layer will use this callback.
> Signed-off-by: Haibo Chen <haibo.chen at nxp.com>
> Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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