mmc: tmio: Clear BUSWIDTH bit when WMODE bit is set

According to latest specification rev.0026, when HOST_MODE bit 0
(WMODE) is not set, HOST_MODE bit 8 (BUSWIDTH) is ignored. Clear
HOST_MODE bit 8 in such case and align the code with Linux and
avoid possible unforeseen issues.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
index 6e656e5..01d8c2b 100644
--- a/drivers/mmc/tmio-common.c
+++ b/drivers/mmc/tmio-common.c
@@ -707,7 +707,7 @@
 	 */
 	if (priv->version >= 0x10) {
 		if (priv->caps & TMIO_SD_CAP_64BIT)
-			tmio_sd_writel(priv, 0x100, TMIO_SD_HOST_MODE);
+			tmio_sd_writel(priv, 0x000, TMIO_SD_HOST_MODE);
 		else
 			tmio_sd_writel(priv, 0x101, TMIO_SD_HOST_MODE);
 	} else {