No need to give the rate any special treatment in netlink attributes
parsing, as unlike for ports, there is only a couple of commands
benefiting from that.

Remove DEVLINK_NL_FLAG_NEED_RATE*, make pre_doit() callback simpler
by moving the rate attributes parsing to rate_*_doit() ops.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230811155714.1736405-3-jiri@resnulli.usSigned-off-by: Jakub Kicinski <kuba@kernel.org>