AP: MLO: Handle Multi-Link element during authentication

AP: MLO: Handle Multi-Link element during authentication

In case the AP is an AP MLD, parse the Multi-Link element from the
Authentication frame, store the relevant information, and prepare the
response Multi-Link element.

If the AP is not an AP MLD or the parsing of the element fails, continue
the authentication flow without MLD support.

For SAE, it is needed to skip various fixed fields in
the Authentication frame. Implement it for SAE with H2E.

TODO: This should be extended to other authentication algorithms which
are allowed for MLD connections and have fixed fields in the
Authentication frames, according to IEEE P802.11-REVme/D3.0, Table 9-69
(Presence of fields and elements in Authentications frames).

This commit doesn't support FILS, FT, etc.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>