I've attached two patches to add more modules to the base-initrd.

The first adds the 'hid-generic' and 'hid-apple' modules, which are
needed to allow the user's disk encryption passphrase to be entered
during early boot on a MacBook 2,1 running Libreboot.  'hid-apple' is
needed for the machine's internal keyboard, and 'hid-generic' is needed
to support an external USB keyboard on that machine.

The second patch adds the 'serpent_generic' and 'wp512' crypto modules,
which support the Serpent cipher and Whirlpool digest algorithms.  These
are needed to mount an encrypted root partition set up with the
following command:

  cryptsetup -v --cipher serpent-xts-plain64 --key-size 512
    --hash whirlpool --use-random --verify-passphrase luksFormat

This is the command suggested in the documentation recently posted here
by Petter <petter@mykolab.ch>, who runs GuixSD on Libreboot machines
with fully encrypted disks (including / and /boot), and to my knowledge
is the first person to do so.

Petter's documentation was used by Albin <albin@fripost.org> to install
GuixSD with fully encrypted disks on a MacBook 2,1 running Libreboot,
but we found that more modules needed to be added to his initrd, hence
these patches.

       Mark