cfg80211: fix BSS color notify trace enum confusion

The wrong enum was used here, leading to warnings.
Just use a u32 instead.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 0d2ab3ae ("nl80211: add support for BSS coloring")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/trace.h

@@ -3628,7 +3628,7 @@ TRACE_EVENT(cfg80211_bss_color_notify,
 	TP_ARGS(netdev, cmd, count, color_bitmap),
 	TP_STRUCT__entry(
 		NETDEV_ENTRY
-		__field(enum nl80211_bss_scan_width, cmd)
+		__field(u32, cmd)
 		__field(u8, count)
 		__field(u64, color_bitmap)
 	),