Configure 5.0ghz wifi on ARM overlay installation

[xinbinhuang]

Hi,

thanks for the great work! Recently, I've used this project https://github.com/sgielen/picl-k3os-image-generator to install k3os on two raspberry pi 4. Currently, I'm using WIFI to connect to internet, but I noticed they connect to the 2.4 GHz band instead of the 5.0ghz. Do you know if there is a way to configure it to use 5.0ghz?

Thanks!

Describe the solution you'd like
Is't possible to expose an option to connect 5.0ghz wifi (e.g. country code or equivalent ) under the wifi section in config.yaml?

Describe alternatives you've considered
I've tried written the country code to config.yaml, but it doesn't help :(.

write_files:
  - path: /etc/wpa_supplicant/wpa_supplicant.conf
    content: |-
      country=US

Additional context
k3os version : v0.21.5-k3s2r1