utility: Query platform wp status with futility

The platform WP status should be queried via futility(1)
not flashrom(1) directly.

BUG=b:296978620
TEST=none

Change-Id: Ic63aaecb5cdeffdeaf0b6a86b240d37a6deb6f30
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/4839758
Reviewed-by: Sam McNally <sammc@chromium.org>
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>