cfg80211: drop duplicated documentation of field "registered"

Field "registered" was documented three times: twice in the
documentation block of struct wiphy and once inside the struct
definition. This patch keep only one comment.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200221115604.594035-3-Jerome.Pouiller@silabs.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -4465,7 +4465,6 @@ struct wiphy_iftype_akm_suites {
  * @debugfsdir: debugfs directory used for this wiphy, will be renamed
  *	automatically on wiphy renames
  * @dev: (virtual) struct device for this wiphy
- * @registered: helps synchronize suspend/resume with wiphy unregister
  * @wext: wireless extension handlers
  * @priv: driver private data (sized according to wiphy_new() parameter)
  * @interface_modes: bitmask of interfaces types valid for this wiphy,
@@ -4690,7 +4689,6 @@ struct wiphy {
 	 * you need use set_wiphy_dev() (see below) */
 	struct device dev;
 
-	/* protects ->resume, ->suspend sysfs callbacks against unregister hw */
 	bool registered;
 
 	/* dir in debugfs: ieee80211/<wiphyname> */