mmc/aspeed: Enable controller clocks

Request and enable the controller level clocks.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/drivers/mmc/aspeed_sdhci.c b/drivers/mmc/aspeed_sdhci.c
index 5591fa2..9d79bf5 100644
--- a/drivers/mmc/aspeed_sdhci.c
+++ b/drivers/mmc/aspeed_sdhci.c
@@ -99,6 +99,21 @@
 
 static int aspeed_sdc_probe(struct udevice *parent)
 {
+	struct clk clk;
+	int ret;
+
+	ret = clk_get_by_index(parent, 0, &clk);
+	if (ret) {
+		debug("%s: clock get failed %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = clk_enable(&clk);
+	if (ret) {
+		debug("%s: clock enable failed %d\n", __func__, ret);
+		return ret;
+	}
+
 	return 0;
 }