cr50: add unsupported as a value for cr50_testlab

Some cr50 images don't have cr50 testlab support. If cr50 returns
'Access Denied', then set cr50_testlab to unsupported.

BUG=b:71556454
BRANCH=none
TEST=run cr50_testlab when cr50 is running 0.0.24

Change-Id: I1e37212660b31b9608bbfc6cb20c44d98802f915
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/869460
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Wai-Hong Tam <waihong@google.com>
1 file changed