Update vboot submodule to upstream master

Updating from commit id 3b80572:
2017-10-12 16:35:30 -0700 - (tlcl, tpmc: extend GetVersion to report vendor specific data)

to commit id f6780a3:
2017-12-01 14:54:40 -0800 - (firmware: header tweaks for depthcharge)

This brings in 19 new commits.

Change-Id: I49b1349cfd9266cd815b68759ae89bdffdd0d74b
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/22777
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed