hostapd: enable airtime policy for the -basic variants

hostapd: enable airtime policy for the -basic variants

Airtime policy configuration is extremely useful in multiple BSS scenarios.
Since nowadays most people configure both private and guest networks (at
least), it makes sense to enable it by default, except for the most limited
of the variants.

Size of the hostapd-basic-openssl binary (mipsel 24Kc -O2):
543944 bytes (airtime policy disabled)
548040 bytes (airtime policy enabled)

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Acked-by: Daniel Golle <daniel@makrotopia.org>