mac80211: Reimplement WME using ->select_queue().

The only behavior change is that we do not drop packets under any
circumstances.  If that is absolutely needed, we could easily add it
back.

With cleanups and help from Johannes Berg.

Signed-off-by: David S. Miller <davem@davemloft.net>

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

diff --cc net/mac80211/Kconfig
Simple merge

diff --cc net/mac80211/Makefile
Simple merge

diff --cc net/mac80211/ieee80211_i.h
Simple merge

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

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

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

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