dm: core: Rename ofnode_get_first/next_property()

Drop the 'get' in these names since it does not fit with the rest of
the API.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/ofread.c b/test/dm/ofread.c
index 8c7dd82..95a24c3 100644
--- a/test/dm/ofread.c
+++ b/test/dm/ofread.c
@@ -14,9 +14,9 @@
 	int res, len, count = 0;
 
 	node = ofnode_path("/cros-ec/flash");
-	for (res = ofnode_get_first_property(node, &prop);
+	for (res = ofnode_first_property(node, &prop);
 	     !res;
-	     res = ofnode_get_next_property(&prop)) {
+	     res = ofnode_next_property(&prop)) {
 		value = ofnode_get_property_by_prop(&prop, &propname, &len);
 		ut_assertnonnull(value);
 		switch (count) {