cfg80211: add firmware and hardware version to wiphy

It's useful to provide firmware and hardware version to user space and have a
generic interface to retrieve them. Users can provide the version information
in bug reports etc.

Add fields for firmware and hardware version to struct wiphy.

(Dropped nl80211 bits for now and modified remaining bits in favor of
ethtool. -- JWL)

Cc: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 241ea14..6f4862b 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1142,6 +1142,9 @@
 	u32 frag_threshold;
 	u32 rts_threshold;
 
+	char fw_version[ETHTOOL_BUSINFO_LEN];
+	u32 hw_version;
+
 	/* If multiple wiphys are registered and you're handed e.g.
 	 * a regular netdev with assigned ieee80211_ptr, you won't
 	 * know whether it points to a wiphy your driver has registered