give back kernel for qemu-x86_64 board

With this fix the image boots up till systemd, but still there are glitches:

• in fstab, the boot partition's filetype set to "None", which breaks the boot process, possible to fix at the first boot in emergency mode
• after fstab is fixed the GUI shows up, but the mouse is hectically jumps around for each movement

Still planning to look into these, hence WIP, but feel free to merge this as needed.