luci-mod-admin-full: prevent accidental deletion of 802.11r nasid

The same wifi option 'nasid' is used for two purposes,
RADIUS NAS ID and 802.11r NAS ID / R0KH-ID.

In LuCI the 'nasid' option has depended on WPA-EAP/WPA2-EAP, which
can lead to accidental deletion of the option, if the user modifies
any wifi settings while he has WPA(2)-PSK & 802.11r mode.

802.11r can also be with WPA(2)-PSK, so add them to the dependency
list of allowed encryptions.

(Note: after this fix the 'nasid' field is shown unnecessarily
to "normal" WPA(2)-PSK users. It might later be set to depend on
802.11r being used, after 802.11r has been added to LuCI.)

Reference to bugs:
https://github.com/openwrt/luci/issues/844
https://dev.openwrt.org/ticket/20764
https://bugs.lede-project.org/index.php?do=details&task_id=274

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>