WPS: Optimize post-WPS scan even if EAP-Failure is not received

WPS: Optimize post-WPS scan even if EAP-Failure is not received

Commit 17a4734dc4d28ef070dfa227b422ed84794f48c5 shall optimize the
post-WPS scan based on the channel used during the provisioning only
when the EAP-Failure frame is received. In cases where the EAP-Failure
frame is missed, this optimization shall not happen resulting in the
scan in all the channels thus consuming more time for the connection.
This commit enhances this by storing the requisite information after
the M8 frame is received.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>