netlink: specs: devlink: extend per-instance dump commands to accept instance attributes

Extend per-instance dump command definitions to accept instance
attributes. Allow parsing of devlink handle attributes so they could
be used for instance selection.

Re-generate the related code.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230811155714.1736405-12-jiri@resnulli.us


Signed-off-by: Jakub Kicinski <kuba@kernel.org>