Update vboot submodule to upstream main

Updating from commit id e681c37:
    change node locked version expectations

to commit id b38e3a63:
    cros_ec: Use boot mode to check if EC can be trusted

Change-Id: Id6de185af85a61a3843b302fef6fa0d4d3c17aef
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55026
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3rdparty/vboot

@@ -1 +1 @@
-Subproject commit e681c371484b50c0cc35d91123b176acdc2449eb
+Subproject commit b38e3a63a8b1d42fd707e4c23e71c3f3ed84e6ad