wifi: iwlwifi: mvm: initiator: move setting the sta_id into a function

Move setting the target's sta_id (and related flags) into a function
to support different versions of the target struct.
This is done as preparation for moving to the new range request
version.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240527190228.18e3a6a6f1cb.I85e3ee607b3947448532bc16730f8898a11c92b8@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>