iwlwifi: differentiate 4965 and 5000 hw ampdu queues number

This patch asks to allocate the correct amount of sw queues according
to hw ampdu queues number.

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>