mmc: change the set_ios return type from void to int

To maintain consistency, set_ios type of legacy mmc_ops changed to int.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c
index cca0b04..7dc4a5d 100644
--- a/drivers/mmc/gen_atmel_mci.c
+++ b/drivers/mmc/gen_atmel_mci.c
@@ -336,7 +336,7 @@
 }
 
 /* Entered into mmc structure during driver init */
-static void mci_set_ios(struct mmc *mmc)
+static int mci_set_ios(struct mmc *mmc)
 {
 	struct atmel_mci_priv *priv = mmc->priv;
 	atmel_mci_t *mci = priv->mci;
@@ -370,6 +370,8 @@
 
 		writel(busw << 7 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
 	}
+
+	return 0;
 }
 
 /* Entered into mmc structure during driver init */