blacklist some video drivers

[DatuX]

I encountered a problem with no console output on older hardware:

[    8.379605] radeon 0000:01:05.0: vgaarb: deactivate vga console

After blacklisting it (And mkinitfs) it was fixed, so we should probably blacklist them all be default:

# Blacklist common GPU drivers
blacklist radeon
blacklist amdgpu
blacklist nouveau
blacklist nvidia
blacklist nvidiafb
blacklist rivafb
blacklist i915
blacklist intel_agp
blacklist drm
blacklist drm_kms_helper