wifi: iwlwifi: mvm: use appropriate link for rate selection

We were still using the deflink in most cases, update the code to use
the appropriate link.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230329100039.fa1025502fb4.Iaba0c64740fdcf04a521e2f213bd3f3e27862472@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>