dm: mmc: socfpga: call dwmci_probe()

On a socfpga_cyclone5 based board the SD card, was never powered up. For
other dw_mmc based SoCs dwmci_probe() is called in the platform specific
probe(). It seems this call is missing for socfpga_dw_mmc.

With this change DWMCI_PWREN is set by dmwci_init().

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/socfpga_dw_mmc.c

@@ -123,7 +123,7 @@ static int socfpga_dwmmc_probe(struct udevice *dev)
 	upriv->mmc = host->mmc;
 	host->mmc->dev = dev;
 
-	return 0;
+	return dwmci_probe(dev);
 }
 
 static int socfpga_dwmmc_bind(struct udevice *dev)