iwlwifi: remove IWL{4965,3945}_QOS

This patch removes the IWL4965_QOS and IWL3945_QOS defines from Kconfig
file along with all uses of it. These defines were relevant for the
period QoS code was tested to be stable in driver's flows.

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