dm: core: Rename of_device_is_compatible()

The of_ prefix conflicts with the livetree version of this function.
Rename it to avoid problems when we add livetree support.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/xenon_sdhci.c b/drivers/mmc/xenon_sdhci.c
index 6cd176f..2b7cb7f 100644
--- a/drivers/mmc/xenon_sdhci.c
+++ b/drivers/mmc/xenon_sdhci.c
@@ -454,7 +454,7 @@
 	host->name = dev->name;
 	host->ioaddr = (void *)devfdt_get_addr(dev);
 
-	if (of_device_is_compatible(dev, "marvell,armada-3700-sdhci"))
+	if (device_is_compatible(dev, "marvell,armada-3700-sdhci"))
 		priv->pad_ctrl_reg = (void *)devfdt_get_addr_index(dev, 1);
 
 	name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "marvell,pad-type",