Move network_WiFi_UpdateRouter to its own suite

This will make wifi_matfunc more consistent.  This is going to
be done in two parts because the preflight check scripts
are unhappy with doing all of this at once.

TEST=None
BUG=chromium:492948

Change-Id: I9bd54d3eaee693d495ae92d3d63bfa7c31d06e4d
Reviewed-on: https://chromium-review.googlesource.com/273681
Trybot-Ready: Kris Rambish <krisr@chromium.org>
Tested-by: Kris Rambish <krisr@chromium.org>
Reviewed-by: Tien Chang <tienchang@chromium.org>
Commit-Queue: Kris Rambish <krisr@chromium.org>
3 files changed