DietPi-Config | Support setting console resolution on ARM with DRM/KMS

[MichaIng]

Creating a feature request

Is your feature request related to a problem? Please describe:

• E.g. #5579
• With mainline kernel and DRM/KMS on ARM (no GRUB) it is not so trivial to set the console screen resolution.

Describe the solution you'd like:

• It can be set via kernel command-line: https://wiki.archlinux.org/title/Kernel_mode_setting#Forcing_modes
• Active DRI devices can be found and their supported modes read out:

  for i in /sys/class/drm/*; do [[ -e $i/status ]] && echo "$i: $(<$i/status)"; done
  

Describe alternatives you've considered:

• There are no alternatives, as long as the image is no shipped with non-mainline kernel/firmware where non-standard bootloader settings, respectively self-explaining kernel command-line arguments are available.
• For X environments, it again needs to be done differently, though.

Additional context

• #5579, https://dietpi.com/forum/t/odroid-c2-1280x390-screen-resolution-is-possible/13275