dm: core: Rename ofnode_get_property_by_prop()

The current name is quite unwieldy. Change it to use an ofprop_ prefix
and shorten it. Fix the return-value comment while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/read.h b/include/dm/read.h
index 519c156..cc4f161 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -1091,7 +1091,7 @@
 						const char **propname,
 						int *lenp)
 {
-	return ofnode_get_property_by_prop(prop, propname, lenp);
+	return ofprop_get_property(prop, propname, lenp);
 }
 
 static inline int dev_read_alias_seq(const struct udevice *dev, int *devnump)