Merge branch 'devlink-rm-dl_argv_parse_put' into next

Jacob Keller  says:

====================

This series removes the dl_argv_parse_put function which both parses the
command line arguments and places them into the netlink header.

This was originally sent as an RFC at
https://lore.kernel.org/netdev/20220805234155.2878160-1-jacob.e.keller@intel.com/

Since there is some ongoing work around policy code being generated from
YAML, I thought it best to wait on the devlink policy portion of this series
for now.

Jiri mentioned he wanted to base some work on top of this, so I am sending
just the cleanup patches.

The primary motivation for this is due to the fact that dl_argv_parse_put
requires a netlink header, meaning a command must have already been
prepared. This prevents addition of a different netlink command to get the
policy data, and thus prevents us from using this variant while checking
netlink policy.

====================

Signed-off-by: David Ahern <dsahern@kernel.org>