tools: ynl-gen: support / skip pads on the way to kernel

Kernel does not have padding requirements for 64b attrs.
We can ignore pad attrs.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -227,12 +227,18 @@ class TypePad(Type):
     def _attr_typol(self):
         return '.type = YNL_PT_IGNORE, '
 
+    def attr_put(self, ri, var):
+        pass
+
     def attr_get(self, ri, var, first):
         pass
 
     def attr_policy(self, cw):
         pass
 
+    def setter(self, ri, space, direction, deref=False, ref=None):
+        pass
+
 
 class TypeScalar(Type):
     def __init__(self, family, attr_set, attr, value):