[FS#1482] IPQ40XX (ac58U) can't work in 5g clinet mode

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - z3panyaoem (z3panyaoem) 

Attached to Project - OpenWrt/LEDE Project
Summary - IPQ40XX (ac58U) can't work in 5g clinet mode
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - My wireless config file is:
config wifi-device 'radio0'
	option type 'mac80211'
	option channel '11'
	option hwmode '11g'
	option path 'platform/soc/a000000.wifi'
	option htmode 'HT20'
	option disabled '1'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ssid 'OpenWrt'
	option encryption 'none'

config wifi-device 'radio1'
	option type 'mac80211'
	option channel '36'
	option hwmode '11a'
	option path 'platform/soc/a800000.wifi'
	option htmode 'VHT80'
	option country 'US'
	option legacy_rates '1'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'wan2'
	option mode 'sta'
	option ssid '@mwan@'
	option encryption 'psk-mixed'
	option key '1234567890'


kernel log see file log.txt

One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1482