QEMU Support: Fix garbled output during text boot

Roland Clobusrequested to merge
rclobus/live-build:rclobus/qemu_vga into master

When the live system is booted in QEMU with the 'VGA' driver, the console output is garbled until the 'bochs' kernel module is loaded. When the 'verify-checksums' kernel command line option is used, the systemd 'modprobe@drm.service' has not been run yet, which would use the kernel module from the live system. Therefore the kernel module is placed inside the initramfs.

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