dt: Add empty of_property_match_string() function

This commit adds an empty of_property_match_string() function for
!CONFIG_OF builds.

Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/include/linux/of.h b/include/linux/of.h
index 2ec1083..597e571 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -377,6 +377,13 @@
 	return -ENOSYS;
 }
 
+static inline int of_property_match_string(struct device_node *np,
+					   const char *propname,
+					   const char *string)
+{
+	return -ENOSYS;
+}
+
 static inline struct device_node *of_parse_phandle(struct device_node *np,
 						   const char *phandle_name,
 						   int index)