Bring debugd into line with name conventions in Platform2

BUG=chromium:220003
TEST=Run ALL the trybots
CQ-DEPEND=CL:56290

Change-Id: Idbbdccfd6c81b82f39db17672512801920692635
Reviewed-on: https://chromium-review.googlesource.com/63781
Reviewed-by: Liam McLoughlin <lmcloughlin@chromium.org>
Tested-by: Liam McLoughlin <lmcloughlin@chromium.org>
Commit-Queue: Liam McLoughlin <lmcloughlin@chromium.org>