mmc: sdhci: Fix sdhci_do_enable_v4_mode

V4_MODE is Bit-15 of SDHCI_HOST_CONTROL2 register.
Need to perform word access to this register.
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Fixes: b3f80b43 ("mmc: sdhci: Add sd host v4 mode")
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.c

@@ -127,12 +127,12 @@ static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
 {
 	u16 ctrl2;
 
-	ctrl2 = sdhci_readb(host, SDHCI_HOST_CONTROL2);
+	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 	if (ctrl2 & SDHCI_CTRL_V4_MODE)
 		return;
 
 	ctrl2 |= SDHCI_CTRL_V4_MODE;
-	sdhci_writeb(host, ctrl2, SDHCI_HOST_CONTROL);
+	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
 }
 
 /*