Add Extended Capabilities element to all Probe Request frames

Add Extended Capabilities element to all Probe Request frames

Always add the Extended Capabilities element to Probe Request frames (in
case it is not all zeros) to publish support for driver advertised
capabilities and wpa_supplicant specific capabilities.

This also fixes the case where Extended Capabilities element was added
for Interworking cases, but did not use the driver advertised ones and
did not handle other capabilities supported by wpa_supplicant.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>