iwlwifi: dvm: rxon: Demote non-conformant kernel-doc headers

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:695: warning: bad line:
 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:701: warning: Function parameter or member 'priv' not described in 'iwl_set_rxon_channel'
 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:701: warning: Function parameter or member 'ctx' not described in 'iwl_set_rxon_channel'
 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:839: warning: Function parameter or member 'ctx' not described in 'iwl_full_rxon_required'
 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:1029: warning: Function parameter or member 'priv' not described in 'iwlagn_commit_rxon'
 drivers/net/wireless/intel/iwlwifi/dvm/rxon.c:1029: warning: Function parameter or member 'ctx' not described in 'iwlagn_commit_rxon'

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Luca Coelho <luciano.coelho@intel.com>
Cc: Intel Linux Wireless <linuxwifi@intel.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200910065431.657636-13-lee.jones@linaro.org

drivers/net/wireless/intel/iwlwifi/dvm/rxon.c

@@ -689,7 +689,7 @@ void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 		_iwl_set_rxon_ht(priv, ht_conf, ctx);
 }
 
-/**
+/*
  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
  * @ch: requested channel as a pointer to struct ieee80211_channel
 
@@ -826,7 +826,7 @@ static int iwl_check_rxon_cmd(struct iwl_priv *priv,
 	return errors ? -EINVAL : 0;
 }
 
-/**
+/*
  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
  * @priv: staging_rxon is compared to active_rxon
  *
@@ -1007,7 +1007,7 @@ static void iwl_calc_basic_rates(struct iwl_priv *priv,
 	ctx->staging.ofdm_basic_rates = ofdm;
 }
 
-/**
+/*
  * iwlagn_commit_rxon - commit staging_rxon to hardware
  *
  * The RXON command in staging_rxon is committed to the hardware and