Tails 2.7 is missing 64-bit VirtualBox kernel modules

Tails 2.7 has virtualbox-guest-{utils,x11} installed, but is missing virtualbox-guest-dmks
and thus does not longer has support for shared folders in virtualbox.

Related issues

Related to #11848 (closed)
Related to #11965 (closed)

Original created by @obfusk on 11992 (Redmine)

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