dt: add empty for_each_child_of_node, of_find_property

The patch adds a couple empty functions for non-dt build, so that
drivers migrating to dt can save some '#ifdef CONFIG_OF'.

Change-Id: If17423786e3109d5090e3419ea5ec59c1a99a058
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Sathish Ambley <sambley@codeaurora.org>
diff --git a/include/linux/of.h b/include/linux/of.h
index 6a1272c..f904bf4 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -241,6 +241,16 @@
 	return false;
 }
 
+#define for_each_child_of_node(parent, child) \
+	while (0)
+
+static inline struct property *of_find_property(const struct device_node *np,
+						const char *name,
+						int *lenp)
+{
+	return NULL;
+}
+
 static inline int of_property_read_u32_array(const struct device_node *np,
 				char *propname, u32 *out_values, size_t sz)
 {