vboot_reference: Allow flashrom_read_image() reading per-region

BUG=b:207808292
BRANCH=none
TEST=`make`

Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Change-Id: I98f1a2566ef50b2c7b1376141bb2f1c096b710a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3358664
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Nikolai Artemiev <nartemiev@google.com>
Commit-Queue: Nikolai Artemiev <nartemiev@google.com>
3 files changed