wifi: iwlwifi: mvm: unify link info initialization

Move the link info initialization to a common function so
that it can be modified more easily later.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241028135215.ab963cc90e56.Ice5cf66dec8351f8e94ca4c5b3a27e9311d0c20a@changeid


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