iwlwifi-2.6: Adds and fixes defines about security

This patch adds some missing defines defines for HW security. It also fixes
the add_station host cmd layout.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>