AP: Skip authentication/deauthentication phase for DMG/IEEE 802.11ad

AP: Skip authentication/deauthentication phase for DMG/IEEE 802.11ad

Authentication and Deauthentication frames are not used in DMG/IEEE
802.11ad networks. For DMG/IEEE 802.11ad the following was implemented:
Upon receiving association request, allocate the sta object and
initialize it as if authentication took place. Upon receiving
disassociation, deallocate the sta object.
ap_sta_disassociate/ap_sta_deauthenticate/ap_sta_disconnect all use
disassociation instead of deauthentication. In driver_nl80211,
i802_sta_deauth() is routed to i802_sta_disassoc().

Signed-off-by: Dedy Lansky <qca_dlansky@qca.qualcomm.com>