connectivity.cfg and wlan.cfg both enable generic networking features and worse they do it in different ways.

As noted in the description of 80fe5a51d743 ("connectivity.cfg:
make advanced networking features as modules"), these networking features should be enabled as modules as they are not required for all use cases and cause performance degradation in cases where they are not actually needed.

Remove configuration of these features from wlan.cfg and keep wlan.cfg limited to WLAN specific options.

Cc: Eyal Reizer
Cc: Yaniv Machani
Signed-off-by: Sekhar Nori