memento_updater: Remove kernel post processing.

The "Release" kernel should now have a valid vblock in it without having to
copy over the one in the stateful partition which is being deprecated.

BUG=chromium:403031
TEST=emerge-lumpy memento_softwareupdate

Change-Id: I974b828e79393d765b6dd76778a5e35dadaa63db
Reviewed-on: https://chromium-review.googlesource.com/213440
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
2 files changed