ynl: skip rendering attributes with header property in uapi mode

To allow omitting some of the attributes in the final generated file.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20241204155549.641348-3-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -801,6 +801,7 @@ def __init__(self, family, yaml):
             self.user_type = 'int'
 
         self.value_pfx = yaml.get('name-prefix', f"{family.ident_name}-{yaml['name']}-")
+        self.header = yaml.get('header', None)
         self.enum_cnt_name = yaml.get('enum-cnt-name', None)
 
         super().__init__(family, yaml)
@@ -2441,6 +2442,9 @@ def render_uapi(family, cw):
         if const['type'] == 'enum' or const['type'] == 'flags':
             enum = family.consts[const['name']]
 
+            if enum.header:
+                continue
+
             if enum.has_doc():
                 if enum.has_entry_doc():
                     cw.p('/**')