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When we support the lowest power mode for Nuvoton in the next spin, we will shed the TCPC/PPC power rail during hibernate. Before we drop the power for the PPCs we need to ensure that Vbus is lower than the hard-coded 6.8V dead-battery mode over-voltage threshold, otherwise we will lock ourselves out of power. BRANCH=none BUG=b:79218851 TEST=verified that yorp renegotiates Vbus to 5V when entering hibernate via ec `hibernate` cmd. Change-Id: I4a98573eefb5757eea02dc48c64d5f9358b5e0b7 Signed-off-by: Jett Rink <jettrink@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1047954 Reviewed-by: Furquan Shaikh <furquan@chromium.org>