mac80211: trace debug messages

It can be very useful to have all debug messages
available when debugging, but hard to correlate
between different sources, so add a trace event
for all mac80211 debug messages.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --cc net/mac80211/Kconfig
Simple merge

diff --cc net/mac80211/debug.h
Simple merge

diff --cc net/mac80211/trace.c
Simple merge

diff --cc net/mac80211/trace.h
Simple merge