vboot: provide a unified flow for separate verstage

The vboot verification in a stage proper is unified
replacing duplicate code in the tegra SoC code. The
original verstage.c file is renamed to reflect its
real purpose. The support for a single verstage flow
is added to the vboot2 directory proper.

TEST=Built glados.

Change-Id: I14593e1fc69a1654fa27b512eb4b612395b94ce5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11744
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
11 files changed