Refactor logic to detect DUT WiFi chip type to be usable remotely

BUG=chromium:385942
TEST=network_WlanDriver still passes against my lumpy.

Change-Id: I13c82651178b8deb3069b3a2066051d1804a58e8
Reviewed-on: https://chromium-review.googlesource.com/204394
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
2 files changed