SSID protection in 4-way handshake on AP

SSID protection in 4-way handshake on AP

Add support for SSID protection in 4-way handshake based on the
mechanism added in IEEE 802.11REVme/D6.0. This is a mitigation against
CVE-2023-52424 (a.k.a. the SSID Confusion Attack).

This functionality is disabled by default and can be enabled with
ssid_protection=1. Once there has been more testing of this to confirm
there is no significant interoperability issues, the goal is to be able
to change this to be enabled by default.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>