mac80211: further simplify ieee80211_bss_info_change_notify

The special case in the function isn't really needed,
instead make the suspend code a bit better and also
easier to understand and move the warning into the
driver op wrapper inline.

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

diff --cc net/mac80211/driver-ops.h
Simple merge

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

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