devlink: don't allow to change net namespace for FW_ACTIVATE reload action

The change on network namespace only makes sense during re-init reload
action. For FW activation it is not applicable. So check if user passed
an ATTR indicating network namespace change request and forbid it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230213115836.3404039-1-jiri@resnulli.us


Signed-off-by: Paolo Abeni <pabeni@redhat.com>