pcr: libreboot-utils: Add spkmodem_recv

When building Coreboot or Libreboot with CONFIG_SPKMODEM, the boot
messages data is encoded as sound and sent to the sound card.

To receive them you can record them with another computer (and ideally
you need an audio cable for that and to make sure that the volume is
not too low or not too high), and you can then decode them in real
time with a command similar to that one:
   parec --channels=1 --rate=48000 --format=s16le | spkmodem-recv

This also works with grub spkmodem console output.

Note that the messages speed is relatively slow, so if you build
Coreboot or Libreboot with that option, your boot might take a long
time (like 30min for instance) if you have a lot of messages.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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