buildroot

wpa_supplicant: bump to version 2.2

Patches are now upstream.

Enable epoll support since any modern kernel/toolchain supports it.

Interworking requires Hotspot functionality which we didn't enable
before so introduce a new option for them.

While at it group and sort the options in a more lean and friendly way.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>