dm: core: Update of_read_fmap_entry() for livetree

Update this function to take an ofnode so that it can work with livetree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index 5fd2cd9..6f299d4 100644
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -1028,7 +1028,7 @@
 		return -1;
 	}
 
-	if (of_read_fmap_entry(flash_node, "flash", &config->flash)) {
+	if (ofnode_read_fmap_entry(flash_node,  &config->flash)) {
 		debug("Failed to decode flash node in chrome-ec\n");
 		return -1;
 	}
@@ -1050,7 +1050,7 @@
 			return -1;
 		}
 
-		if (of_read_fmap_entry(node, "reg", &config->region[region])) {
+		if (ofnode_read_fmap_entry(node, &config->region[region])) {
 			debug("Failed to decode flash region in chrome-ec'\n");
 			return -1;
 		}