[coreboot-gerrit] Change in coreboot[master]: Update vboot submodule to upstream master

[Julius Werner (Code Review)]

Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37472 )

Change subject: Update vboot submodule to upstream master
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Patch Set 2:
> Are we adding so much code in these 13 new commits?

This is due to the loop unrolling. Once my patches to disable it in coreboot land, this should work again. (Will have to do the whole uprev in one CL then since we've kinda crossed dependencies now.)