[MMC] Fix incorrect register access

There was a writel() being used on a 16-bit register.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 8933191..6aba4a0 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -565,7 +565,7 @@
 	if (cmd->data)
 		flags |= SDHCI_CMD_DATA;
 
-	writel(SDHCI_MAKE_CMD(cmd->opcode, flags),
+	writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 		host->ioaddr + SDHCI_COMMAND);
 }