wifi: iwlwifi: mvm: Fix _iwl_mvm_get_scan_type()

The usage of the 'dtim_period' value was wrong, as it is only
a multiplier of the beacon interval, and thus, beacon interval should
also be considered. Fix it.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230416154301.e08293d6cace.I25f8cea3189472bd714676ca38b121d7c60fb9d9@changeid


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