mmc: fsl_esdhc: make if(CONFIG_IS_ENABLED(CLK)) an #if statement

Not all architectures(i.e. i.MXRT) support mxc_get_clock() and use DM_CLK
instead. So building could result in failure due to missing
mxc_get_clock().

Make if(CONFIG_IS_ENABLED(CLK)) an #if statement.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c
index a698184..3416e9b 100644
--- a/drivers/mmc/fsl_esdhc_imx.c
+++ b/drivers/mmc/fsl_esdhc_imx.c
@@ -1523,27 +1523,27 @@
 
 	init_clk_usdhc(dev->seq);
 
-	if (CONFIG_IS_ENABLED(CLK)) {
-		/* Assigned clock already set clock */
-		ret = clk_get_by_name(dev, "per", &priv->per_clk);
-		if (ret) {
-			printf("Failed to get per_clk\n");
-			return ret;
-		}
-		ret = clk_enable(&priv->per_clk);
-		if (ret) {
-			printf("Failed to enable per_clk\n");
-			return ret;
-		}
-
-		priv->sdhc_clk = clk_get_rate(&priv->per_clk);
-	} else {
-		priv->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK + dev->seq);
-		if (priv->sdhc_clk <= 0) {
-			dev_err(dev, "Unable to get clk for %s\n", dev->name);
-			return -EINVAL;
-		}
+#if CONFIG_IS_ENABLED(CLK)
+	/* Assigned clock already set clock */
+	ret = clk_get_by_name(dev, "per", &priv->per_clk);
+	if (ret) {
+		printf("Failed to get per_clk\n");
+		return ret;
 	}
+	ret = clk_enable(&priv->per_clk);
+	if (ret) {
+		printf("Failed to enable per_clk\n");
+		return ret;
+	}
+
+	priv->sdhc_clk = clk_get_rate(&priv->per_clk);
+#else
+	priv->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK + dev->seq);
+	if (priv->sdhc_clk <= 0) {
+		dev_err(dev, "Unable to get clk for %s\n", dev->name);
+		return -EINVAL;
+	}
+#endif
 
 	ret = fsl_esdhc_init(priv, plat);
 	if (ret) {