P2P: Allow per-device PSK to be assigned
"wpa_cli p2p_set per_sta_psk <0/1>" can now be used to disable/enable use of per-device PSKs in P2P groups. This is disabled by default. When enabled, a default passphrase is still generated by the GO for legacy stations, but all P2P and non-P2P devices using WPS will get a unique PSK. This gives more protection for the P2P group by preventing clients from being able to derive the unicast keys used by other clients. This is also a step towards allowing specific clients to be removed from a group reliably without having to tear down the full group to do so. Signed-hostap: Jouni Malinen <j@w1.fi>master
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