pcr: libreboot-utils: Add bincfg
The bincfg utility enable to convert various binary formats to text
file and vice-versa.
It supports the GM45 Intel Flash Descriptor (IFD) which is contains
the flash chip partition table and various settings including
read/write permissions for the various flash partitions.
Beware when changing the values in ways that have not been tested
before as it could lead to non-booting computers. This is for instance
the case when trying to set the BIOS partition read-only for all "CPUs"
(Management Engine, main CPU, and Gigabit Ethernet).
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>