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When enable CCD, we expect DP/USB super speed MUX is switched to USB and reset RFU polarity MUX for USB2 to recognize correct devices. BRANCH=none BUG=chrome-os-partner:44977 TEST=manual Connect plankton's type-c to a PD sink, switch plankton to power source switch DP MUX to DP, and press CCD button. Super speed MUX should be switch to USB3 mode. And if the PD sink supports CCD, host computer should be able to recognize CCD devices. Signed-off-by: Rong Chang <rongchang@chromium.org> Change-Id: I61c80d9a41c368450a9c9f33a20d99eef83a437d Reviewed-on: https://chromium-review.googlesource.com/303285 Reviewed-by: Alec Berg <alecaberg@chromium.org> Reviewed-by: Todd Broch <tbroch@chromium.org>