[coreboot] Master currently broken on Thinkpad X230 when using option table

[Merlin Büge]

Hi,

on my Thinkpad X230 coreboot master does not boot when using the option
CONFIG_USE_OPTION_TABLE=y. The screen just stays black. I have no log.
This may also affect other platforms(?).

I git-bisected the issue and it seems the following commit has
introduced it:

9d0cc2aea9 cbfs: Introduce cbfs_ro_map() and cbfs_ro_load()
https://review.coreboot.org/c/coreboot/+/39306

Attached is a working an non-working defconfig. Note that
CONFIG_NVRAMCUI_SECONDARY_PAYLOAD=y pulls in CONFIG_USE_OPTION_TABLE=y
as a dependency.

Regards,