hostap: Add an option to remove advanced features

For a memory constrained system, basic Wi-Fi is enough, so, add a
configuration option to compiled out advanced Wi-Fi features.

This also supports choosing individual features if needed.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>