iwlwifi: mvm: stop claiming NL80211_EXT_FEATURE_SET_SCAN_DWELL

We've removed the code that handles it appropriately, so stop
claiming we support it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20201008180656.3b8936035273.I7799caa225295de44558e9da093b720afe606359@changeid

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -677,8 +677,6 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 				      NL80211_EXT_FEATURE_SCAN_START_TIME);
 		wiphy_ext_feature_set(hw->wiphy,
 				      NL80211_EXT_FEATURE_BSS_PARENT_TSF);
-		wiphy_ext_feature_set(hw->wiphy,
-				      NL80211_EXT_FEATURE_SET_SCAN_DWELL);
 	}
 
 	if (iwl_mvm_is_oce_supported(mvm)) {