rockchip: mmc: Update the driver to use the new clock ID

We can use the new clk_get_by_index() function to get the correct clock.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/clk_rk3288.c b/drivers/clk/clk_rk3288.c
index fdc5347..d294788 100644
--- a/drivers/clk/clk_rk3288.c
+++ b/drivers/clk/clk_rk3288.c
@@ -541,8 +541,8 @@
 	gclk_rate = clk_get_rate(gclk);
 	switch (periph) {
 	case HCLK_EMMC:
+	case HCLK_SDMMC:
 	case HCLK_SDIO0:
-	case HCLK_SDIO1:
 		new_rate = rockchip_mmc_get_clk(priv->cru, gclk_rate, periph);
 		break;
 	case SCLK_SPI0: