wil6210: Demote non-kerneldoc headers to standard comment blocks

No effort has been made to document any of the function parameters here.

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

 drivers/net/wireless/ath/wil6210/cfg80211.c:1749: warning: Function parameter or member 'ies' not described in '_wil_cfg80211_find_ie'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1749: warning: Function parameter or member 'ies_len' not described in '_wil_cfg80211_find_ie'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1749: warning: Function parameter or member 'ie' not described in '_wil_cfg80211_find_ie'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1749: warning: Function parameter or member 'ie_len' not described in '_wil_cfg80211_find_ie'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'ies1' not described in '_wil_cfg80211_merge_extra_ies'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'ies1_len' not described in '_wil_cfg80211_merge_extra_ies'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'ies2' not described in '_wil_cfg80211_merge_extra_ies'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'ies2_len' not described in '_wil_cfg80211_merge_extra_ies'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'merged_ies' not described in '_wil_cfg80211_merge_extra_ies'
 drivers/net/wireless/ath/wil6210/cfg80211.c:1780: warning: Function parameter or member 'merged_len' not described in '_wil_cfg80211_merge_extra_ies'

Cc: Maya Erez <merez@codeaurora.org>
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: wil6210@qti.qualcomm.com
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/20200814113933.1903438-14-lee.jones@linaro.org