hostapd-common: add missing ingredients for standalone EAP server

hostapd-common: add missing ingredients for standalone EAP server

Namely radius_server_auth_port and radius_server_clients arguments. Below is a working config example:

config wifi-iface 'enterprise1'
        option device 'radio1'
        option mode 'ap'
        option network 'lan'
        option ssid 'openwrt'
        option encryption 'wpa2'
        option dh_file '/etc/hostapd/dh.pem'
        option eap_server '1'
        option eap_user_file '/etc/hostapd/eap_user'
        option ca_cert '/etc/hostapd/ca.pem'
        option server_cert '/etc/hostapd/server.crt'
        option private_key '/etc/hostapd/server.key'
        option radius_server_clients '/etc/hostapd/radius_clients'
        option radius_server_auth_port 1812

config wifi-iface 'enterprise2'
        option device 'radio2'
        option mode 'ap'
        option network 'lan'
        option ssid 'openwrt'
        option encryption 'wpa2'
        option dh_file '/etc/hostapd/dh.pem'
        option auth_server '127.0.0.1'
        option auth_secret 'radius_secret'
        option auth_cache '0'

Signed-off-by: Lev A. Melnikovsky <melnikovsky@gmail>
Link: https://github.com/openwrt/openwrt/pull/16112
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>