Change in coreboot[master]: mb/google/volteer/baseboard: Configure chipset_lockdown seperately

[Tim Wawrzynczak (Code Review)]

Attention is currently required from:  Felix Singer, Angel Pons.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56209 )

Change subject: mb/google/volteer/baseboard: Configure chipset_lockdown seperately
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Patch Set 2:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/56209/comment/3e788617_e4c73ade 
PS2, Line 12: seperetaly
separately

https://review.coreboot.org/c/coreboot/+/56209/comment/e6c459ac_17f54524 
PS2, Line 10: since their configuration of
            : `common_soc_config` overwrites the configuration of the baseboard's
            : devicetree.
This is an issue with sconfig (it can't tell apart these two cases, even though it's setting the exact same field in the generated C code, although properly fixing it would be very tricky

Patchset:

PS2: 
I think it would be OK to drop this change, and just keep the next one; they will still all have CHIPSET_LOCKDOWN_COREBOOT selected (this one should be set at the baseboard level, not variants).