mmc: fsl_esdhc_imx: correct the actual card clock

The original code logic can not show the correct card clock, and also
has one risk when the div is 0. Because there is div -=1 before.

So move the operation before div -=1, and also involve ddr_pre_div
to get the correct value.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Marek Vasut <marex@denx.de>
1 file changed