Revert "iwlwifi: fix the reclaimed packet tracking upon flush queue"

This reverts commit f590dcec
which has been reported to cause issues.

See https://lkml.org/lkml/2013/1/20/4

 for further details.

Cc: stable@vger.kernel.org [3.7]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>