[S] Change in coreboot[main]: vendorcode/google/chromeos: API to read factory config

[Tim Van Patten (Code Review)]

Attention is currently required from: Eric Lai, Kapil Porwal, Nick Vaccaro, Shelley Chen, Subrata Banik.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/79737?usp=email )

Change subject: vendorcode/google/chromeos: API to read factory config
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Patch Set 4: Code-Review+1

(1 comment)

File src/vendorcode/google/chromeos/branding.c:

PS4: 
nit: While we're currently getting the factory config to determine if CBX branding is enabled or not, the factory config value may contain other information in the future.

I suggest re-naming this file to `tpm_factory_config.c` (or something similar) to generalize things a bit more in case additional bits are added in the future un-related to CBX.