Revert "mmc: dw_mmc: rockchip: select proper card clock"

The origin patch get rockchip dwmmc by name 'ciu', which lead
to the SPL not able to remove 'clock-names' node in dts.
I'm not saying this is not correct, but I would prefer to handle
this in dts or clock driver to save memory for SPL.
For example the rk3288 SPL size has out of memory if not enable
BACK_TO_BROM option, there are many other SoCs has less internal
memory than rk3288.

This reverts commit 480a9b834c.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/mmc/rockchip_dw_mmc.c

@@ -44,7 +44,7 @@ static uint rockchip_dwmmc_get_mmc_clk(struct dwmci_host *host, uint freq)
 
 	ret = clk_set_rate(&priv->clk, freq);
 	if (ret < 0) {
-		printf("%s: err=%d\n", __func__, ret);
+		debug("%s: err=%d\n", __func__, ret);
 		return ret;
 	}
 
@@ -122,7 +122,7 @@ static int rockchip_dwmmc_probe(struct udevice *dev)
 	if (ret < 0)
 		return ret;
 #else
-	ret = clk_get_by_name(dev, "ciu", &priv->clk);
+	ret = clk_get_by_index(dev, 0, &priv->clk);
 	if (ret < 0)
 		return ret;
 #endif