SSIDs may contain UTF8 characters but ideally hostapd should be told
this is the case so it can advertise the fact. Default enable this
option.
add uci option utf8_ssid '0'/'1' for disable/enable e.g.
config wifi-iface
option utf8_ssid '0'
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>