wifi: iwlwifi: remove disable_dummy_notification

This struct member is read-only, so can never change away
from the default value of zero. Remove the code that's in
an if on the value, since it's effectively dead code.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230620125813.e7c96d0aa805.I5b158ce15e48393d2896c0bff9f644d983f0e92d@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-config.h

@@ -388,7 +388,6 @@ struct iwl_cfg {
 	    high_temp:1,
 	    mac_addr_from_csr:10,
 	    lp_xtal_workaround:1,
-	    disable_dummy_notification:1,
 	    apmg_not_supported:1,
 	    vht_mu_mimo_supported:1,
 	    cdb:1,

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

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2013-2014, 2018-2019, 2022 Intel Corporation
+ * Copyright (C) 2013-2014, 2018-2019, 2022-2023 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  */
 #include "mvm.h"
@@ -180,9 +180,6 @@ static int iwl_mvm_sf_config(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	};
 	int ret = 0;
 
-	if (mvm->cfg->disable_dummy_notification)
-		sf_cmd.state |= cpu_to_le32(SF_CFG_DUMMY_NOTIF_OFF);
-
 	/*
 	 * If an associated AP sta changed its antenna configuration, the state
 	 * will remain FULL_ON but SF parameters need to be reconsidered.