Change in coreboot[master]: soc/intel: Drop CID1 from GNVS

[Lance Zhao (Code Review)]

Attention is currently required from: Furquan Shaikh, Subrata Banik, Kyösti Mälkki, Patrick Rudolph.
Lance Zhao has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50297 )

Change subject: soc/intel: Drop CID1 from GNVS
......................................................................

Patch Set 2:

(1 comment)

File src/soc/intel/common/block/include/intelblocks/nvs.h:

https://review.coreboot.org/c/coreboot/+/50297/comment/38617acc_73830070 
PS2, Line 23: unused_was_cid1
> Removing these fields would affect the layout of the structure, and the comments would need to be up […]

But the structure is defined and used within coreboot, there's no 3rdparty dependency. so shall be safe to do so right?
But fail build as a fail-safe protection make some sense, what about a follow up commit to totally drop it?