Update vboot submodule to upstream master

Updating from commit id 304aa429:
2019-03-12 10:38:56 -0700 - (futility: updater: Unit test for preserving sections using FMAP flags)

to commit id e7edff66:
2019-05-03 07:02:32 -0700 - (vboot: implement DISPLAY_INIT context and SD flag)

This brings in 45 new commits.

Change-Id: I7493e43bddc553f9724de46130ccb4cb44e18573
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32612
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 0 insertions, 0 deletions

diff --git a/3rdparty/vboot b/3rdparty/vboot
-Subproject 304aa429c1a04cda3ab2ce37b9e31af84405bfc
+Subproject e7edff6653e16ed915c3ad12234d133d1ef4dcc