dm: mmc: intialize dev when probe

Need to initialize mmc->dev when probe, or will met
"dev_get_uclass_priv: null device", when `mmc dev 1`.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/mmc/fsl_esdhc.c

@@ -1010,6 +1010,7 @@ static int fsl_esdhc_probe(struct udevice *dev)
 	}
 
 	upriv->mmc = priv->mmc;
+	priv->mmc->dev = dev;
 
 	return 0;
 }