Creating a new suite "wifi_matfunc_preflight"

This has the same tests as does wifi_matfunc.
Creating new suite with different name so that we
can have matfunc run on preflight boards.

BUG=chromium:428945
TEST=None

Change-Id: Id24f5aaab8a4de0fff1de0a1879cda553e23ba40
Reviewed-on: https://chromium-review.googlesource.com/230587
Reviewed-by: Prashanth B <beeps@chromium.org>
Reviewed-by: Kris Rambish <krisr@chromium.org>
Commit-Queue: Bindu Mahadev <bmahadev@chromium.org>
Tested-by: Bindu Mahadev <bmahadev@chromium.org>
72 files changed