wlantest: Get STA IEs based on EAPOL-Key msg 2/4 before PTK derivation

wlantest: Get STA IEs based on EAPOL-Key msg 2/4 before PTK derivation

The previous implementation tried to update STA IE information based on
EAPOL-Key msg 2/4 to be able to handle captures that do not include the
(Re)Association Request frame. This was not sufficient (OSEN was not
included) and was done too late (the parsed information is needed for
PMK-to-PTK derivation).

Move the IE update step to happen before trying to derive the PTK if no
(Re)Association Request frame has been seen.

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