tools: ynl-gen: fill in implementations for TypeUnused

Fill in more empty handlers for TypeUnused. When 'unused'
attr gets specified in a nested set we have to cleanly
skip it during code generation.
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231213231432.2944749-5-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/ynl-gen-c.py

@@ -264,6 +264,15 @@ class TypeUnused(Type):
     def attr_policy(self, cw):
         pass
 
+    def attr_put(self, ri, var):
+        pass
+
+    def attr_get(self, ri, var, first):
+        pass
+
+    def setter(self, ri, space, direction, deref=False, ref=None):
+        pass
+
 
 class TypePad(Type):
     def presence_type(self):