Change in coreboot[master]: src/lib: Add FW_CONIFG_SOURCE_VPD

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Jamie Ryu, Wonkyu Kim, Ravishankar Sarawadi, Julius Werner, Subrata Banik, Nick Vaccaro, Srinidhi N Kaushik, Raj Astekar.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58839 )

Change subject: src/lib: Add FW_CONIFG_SOURCE_VPD
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Patch Set 9:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/58839/comment/b75bb1b8_67341011 
PS9, Line 7: CONIFG_
CONFIG

File src/lib/fw_config.c:

https://review.coreboot.org/c/coreboot/+/58839/comment/9bba9913_4fba653a 
PS9, Line 49: int32_t
nit: I would prefer this type to match the type of `vpd_get_int`, which just takes an `int *`