3rdparty/vboot: update to latest master

Half a year has passed. Fixes went in. Probably bugs, too.
However, nobody really supports our local vboot version anymore.

Change-Id: I5042f23686dfe98e540c482f744e9df2d7df3b19
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/16055
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/3rdparty/vboot b/3rdparty/vboot
index d187cd3..46b77fb 160000
--- a/3rdparty/vboot
+++ b/3rdparty/vboot
@@ -1 +1 @@
-Subproject commit d187cd3fc792f8bcefbee4587c83eafbd08441fc
+Subproject commit 46b77fb2f04941c869c3a98cd17e9209c36b2917