qca-wifi: Increase restart request timer to 20s

In independent repeater scenario where STA vdev takes longer for
auth/assoc, and the AP vdevs are waiting on restart request may lead
to restart timeout.

Hence increase restart timeout to 20s which is higher than auth/assoc
timeout.

Change-Id: I5d2a0859e368feda4e1c6d3824eefdbc248b9bac
1 file changed