vboot: clear recovery request subcode when recovery UI is reached

CL:2044954 moved clear recovery request into vboot_api_kernel.
We'd like to leave the subcode so that we can pipe it through
as a UMA statistic.  But it's breaking FAFT at the moment.
Unconditionally clear it until we have a more detailed design.

BUG=b:124141368, b:35576380
TEST=make clean && make runtests
BRANCH=none

Change-Id: Ib90c746779ca58e0d0100bb0b42a29c2b5a100dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2063198
Reviewed-by: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: EricR Lai <ericr_lai@compal.corp-partner.google.com>
2 files changed