vboot: add vb2api_gbb_get_flags function

BUG=b:124141368, chromium:954774
TEST=make clean && make runtests
BRANCH=none

Change-Id: I7b422e8a26621720a6b7efc5211629996a6aa385
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1659989
Tested-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Julius Werner <jwerner@chromium.org>
Auto-Submit: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
3 files changed