netlink: specs: remove redundant type keys from attributes in subsets

No longer needed to define type for subset attributes. Remove those.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20231006114436.1725425-3-jiri@resnulli.us


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