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If USB hub is connected to the type-C port, we need to reset the hub whenever a cable plugs in. Otherwise, USB3.0 may fail to enumerate. BRANCH=None BUG=None TEST=Plug/unplug cable and measure hub reset signal. Change-Id: I60f67c83653d532971ee156914fe6ae0ecdb8d3a Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/229490 Reviewed-by: Pin-chih Lin <johnylin@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org>