cft: remove usage of fw-config.json

fw-config.json was never used and is now being removed in favor of
`futility --servo`

BUG=None
TEST=CQ

Change-Id: I07551f15bc737be9e735bbff4b6f7764bf6da21c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/4489946
Auto-Submit: Sergey Frolov <sfrolov@google.com>
Tested-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Kevin Shelton <kmshelton@chromium.org>
Reviewed-by: Seewai Fu <seewaifu@google.com>
4 files changed