hostapd: fix wpa_supplicant mac address allocation on ap+sta

hostapd: fix wpa_supplicant mac address allocation on ap+sta

If the full interface is restarted while bringing up an AP, it can trigger a
wpa_supplicant interface start before wpa_supplicant is notified of the
allocated mac addresses.
Fix this by moving the iface_update_supplicant_macaddr call to just after
the point where mac addresses are allocated.

Reported-by: Michael-cy Lee (李峻宇) <Michael-cy.Lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit abceef120d57bf066941882630a76788eb4985a9)