ynl-gen-c.py: render netlink policies static for split ops

When policies are rendered for split ops, they are consumed in the same
file. No need to expose them for user outside, make them static.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230803111340.1074067-5-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1843,13 +1843,13 @@ def print_ntf_type_free(ri):
 
 
 def print_req_policy_fwd(cw, struct, ri=None, terminate=True):
-    if terminate and ri and kernel_can_gen_family_struct(struct.family):
+    if terminate and ri and policy_should_be_static(struct.family):
         return
 
     if terminate:
         prefix = 'extern '
     else:
-        if kernel_can_gen_family_struct(struct.family) and ri:
+        if ri and policy_should_be_static(struct.family):
             prefix = 'static '
         else:
             prefix = ''
@@ -1877,6 +1877,10 @@ def kernel_can_gen_family_struct(family):
     return family.proto == 'genetlink'
 
 
+def policy_should_be_static(family):
+    return family.kernel_policy == 'split' or kernel_can_gen_family_struct(family)
+
+
 def print_kernel_op_table_fwd(family, cw, terminate):
     exported = not kernel_can_gen_family_struct(family)