cfg80211: Add wiphy_info_once()

Add wiphy_info_once() helper that prints info message only once.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210511211549.30571-1-digetx@gmail.com

include/net/cfg80211.h

@@ -8154,6 +8154,8 @@ bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
 	dev_notice(&(wiphy)->dev, format, ##args)
 #define wiphy_info(wiphy, format, args...)			\
 	dev_info(&(wiphy)->dev, format, ##args)
+#define wiphy_info_once(wiphy, format, args...)			\
+	dev_info_once(&(wiphy)->dev, format, ##args)
 
 #define wiphy_err_ratelimited(wiphy, format, args...)		\
 	dev_err_ratelimited(&(wiphy)->dev, format, ##args)