Install fails on arm64 due to intel driver

[petrlmat]

It would be nice to have linux-setup environment available even on arm64 platforms and I believe it requires only slight modifications.

The package xserver-xorg-video-intel that contains drivers for intel chipsets (https://packages.debian.org/sid/xserver-xorg-video-intel) is installed by default. The package is not available for arm64 platform and thus the install script fails. The driver does not have to be installed for arm64. https://github.com/klaxalk/linux-setup/blob/1b7e62b1420e3d8f067691892b7af939cafc36d0/install.sh#L51