Merge "wifi: Two AP instances use the same interface name"

// concurrent STA and not dual AP, else start with idx 0.

std::string WifiChip::allocateApIfaceName() {

    // Check if we have a dedicated iface for AP.

    std::vector<std::string> ifnames = getPredefinedApIfaceNames(false);

    if (!ifnames.empty()) {

        return ifnames[0];

    std::vector<std::string> ifnames = getPredefinedApIfaceNames(true);

    for (auto const& ifname : ifnames) {

        if (findUsingName(ap_ifaces_, ifname)) continue;

        return ifname;

    }

    return allocateApOrStaIfaceName(IfaceType::AP, startIdxOfApIface());

}