Answer
Two options to support softAP mode with 80MHz in 5GHz band.
Supplicant:
sdcsupp -Dnl80211 -c /etc/wpa_supplicant_ap.conf -i wlan0 -B
# cat /etc/wpa_supplicant_ap.conf
ctrl_interface=/var/run/wpa_supplicant_1
network={
mode=2
ssid="vht-80"
scan_ssid=1
key_mgmt=NONE
frequency=5180
vht=1
ht40=1
max_oper_chwidth=1
vht_center_freq1=5210
}
Hostapd:
iw dev wlan0 interface add wlan1 type __ap
hostapd /etc/hostapd.conf -B
# cat /etc/hostapd.conf
interface=wlan1
driver=nl80211
ssid=Miles_80MHz_AP
hw_mode=a
channel=36
ieee80211n=1
ieee80211ac=1
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=42
ht_capab=[HT40+]
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