Linux kernel drivers to expose additional coreboot functions

[Patrick Rudolph]

Dear folks,
in order to better support userspace tools like fwupd[1] I've send
patches to expose more coreboot functions using the google firmware
drivers[2].
Both functions depend on the FMAP being placed in a cbmem buffer[3].

This particular patch set allows to read the FMAP and get the active
CBFS partition in use.
Please test and review.

[1]: https://github.com/fwupd/fwupd/pull/1370
[2]: https://lkml.org/lkml/2019/10/8/378
[3]: https://review.coreboot.org/c/coreboot/+/35377

Regards,
Patrick Rudolph

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