Change in coreboot[master]: drivers/efi: Add EFI variable store option support

[Michał Żygowski (Code Review)]

Attention is currently required from: Sean Rhodes, Martin Roth, Patrick Rudolph, Jakub Czapiga, Matt DeVillier.
Michał Żygowski has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52564 )

Change subject: drivers/efi: Add EFI variable store option support
......................................................................

Patch Set 10:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/52564/comment/258ec832_251d9dde 
PS5, Line 18: - Init store with FVH when blank
> Updated the commit message with more information. […]

Ack

https://review.coreboot.org/c/coreboot/+/52564/comment/1d98512e_3ab14c93 
PS5, Line 20: - Reclaim memory when store is full
> Updated the commit message with more information. […]

Ack