luci-mod-network: wireless.js: fix 802.11r dependencies

luci-mod-network: wireless.js: fix 802.11r dependencies

Don't allow enabling 802.11r when using WPA, it needs at least WPA2.

This is because 802.11r advertises FT support in-part through the
Authentication and Key Management (AKM) suites in the Robust
Security Network (RSN) Information Element, which was included in
the 802.11i amendment and WPA2 certification program.

Pre-standard WPA did not include the RSN IE, but the WPA IE.
This IE can not advertise the AKM suite for FT.

Also restrict ft_psk_generate_local to psk2 and psk-mixed. Using it
with non-psk encryptions breaks roaming.

Signed-off-by: Jesus Fernandez Manzano <jesus.manzano@galgus.ai>