HS 2.0: Include HS 2.0 Indication element only for HS 2.0 association

HS 2.0: Include HS 2.0 Indication element only for HS 2.0 association

The Hotspot 2.0 specification seems to mandate this element to be
included in all (Re)Association Request frames if the station is Hotspot
2.0 capable. However, that results in conflicts with other requirements
like no TKIP use when this element is present. The design is really
supposed to include the indication element only for Hotspot 2.0
associations regardless of what the current specification implies.
Remove the HS 2.0 Indication element from (Re)Association Request frame
whenever the connection is not for Hotspot 2.0 purposes.

Signed-hostap: Jouni Malinen <j@w1.fi>