enforce kernel module software signature verification [module signing] / disallow kernel module loading by default

This broke starting a graphical desktop environment in VirtualBox when upgrading Whonix 15.0.0.3.3 from Whonix stable repository.

sudo modprobe vboxdrv
modprobe: ERROR: could not insert ‘vboxdrv’: Required key not available

Upstream bug reports:

Will therefore revert.

Fixing this for real should be possible by either just signing the VirtualBox guest additions modules:

Or better a more generic solution of signing all DKMS modules:

Once this is sorted, can be re-enabled.

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