Revert "wifi: mac80211: fix RCU list iterations"

This reverts commit b0b2dc1e which is
commit ac351800 upstream.

It should not have been backported here due to lack of other rcu
changes in the stable branches.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>