[XS] Change in coreboot[main]: Update vboot submodule to upstream main

[Uwe Poeche (Code Review)]

Uwe Poeche has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78865?usp=email )

Change subject: Update vboot submodule to upstream main
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Patch Set 4:

(1 comment)

Patchset:

PS4: 
With this patch we get problems when we build our mc_apl4 mainboard. We could isolate the problem to build step of futility independently from our mainboard:
cd util/futility
make
and get undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
We bisected the tree in 3rdparty/vboot/ and came to the conclusion that the last commit c59794a6 is the cause. We could also solve it via add "-ldl" at end of line 173 in 3rdparty/vboot/Makefile. It seems that this commit belongs to a not ready patch train (vboot: support signing with pkcs11 private key)