This reverts commit dd9c4640.

With "iwl{4965,3495): workaround for firmware frame tx rejection"
patches we can enable IEEE80211_HW_REPORTS_TX_ACK_STATUS again.
Tested-by: Jake Edge <jake@lwn.net>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>