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/core/device.c b/drivers/core/device.c
index 363c183..f5e8541 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -701,7 +701,7 @@
 	return 0;
 }
 
-bool of_device_is_compatible(struct udevice *dev, const char *compat)
+bool device_is_compatible(struct udevice *dev, const char *compat)
 {
 	const void *fdt = gd->fdt_blob;