mmc: fsl_esdhc: fix mmc->clock with actual clock

Fix mmc->clock with actual clock which is divided by the
controller, and record it with priv->clock which was removed
accidentally.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index c53751d..ce87416 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -523,6 +523,9 @@
 	while (sdhc_clk / (div * pre_div) > clock && div < 16)
 		div++;
 
+	mmc->clock = sdhc_clk / pre_div / div;
+	priv->clock = mmc->clock;
+
 	pre_div >>= 1;
 	div -= 1;