mmc: msm_sdhci: use a more sensible default clock rate

We currently default to the lowest rate but this actually doesn't work
on most platforms. Default to the HS400 speed instead which is most
common on Qualcomm platforms.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c
index ea5d6b4..2144772 100644
--- a/drivers/mmc/msm_sdhci.c
+++ b/drivers/mmc/msm_sdhci.c
@@ -62,7 +62,7 @@
 
 	ret = ofnode_read_u32(node, "clock-frequency", (uint *)(&clk_rate));
 	if (ret)
-		clk_rate = 400000;
+		clk_rate = 201500000;
 
 	ret = clk_get_bulk(dev, &prv->clks);
 	if (ret) {