[S] Change in coreboot[master]: vboot: Fix hash digest size, padding and comparison

[Jakub Czapiga (Code Review)]

Attention is currently required from: Caveh Jalali, Julius Werner, Yu-Ping Wu, Boris Mittelberg.

Jakub Czapiga has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/69762 )

Change subject: vboot: Fix hash digest size, padding and comparison
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Patch Set 2:

(1 comment)

File src/security/vboot/vboot_logic.c:

https://review.coreboot.org/c/coreboot/+/69762/comment/53d450d4_3a7b31fc 
PS1, Line 344: 			uint8_t hash_digest[VBOOT_MAX_HASH_SIZE];
> Should we do this in vboot_save_hash()? Seems like a weird quirk of the backing store that doesn't r […]

I moved it to vboot_save_hash().
handle_digest_result() also required some rework to allow for vb2_hash to be used in the S3 resume path.