chromeos-base/hps-firmware: discover all Python unit tests

Same as: https://crrev.com/c/3813080

BUG=b:232024610
TEST=FEATURES=test emerge-brya hps-firmware

Cq-Depend: chromium:3813080
Change-Id: I9e2d5c70b2b7d8c9edd3254c62eaef5381fcbbb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3813055
Reviewed-by: David Lattimore <dml@chromium.org>
Tested-by: Dan Callaghan <dcallagh@chromium.org>
Commit-Queue: Dan Callaghan <dcallagh@chromium.org>
1 file changed