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This allows the AP to protect a I2C passthru bus. A board-specific function then defines what I2C commands are allowed, so that we can white/black list some addresses (e.g. I2C address allowing PD chip FW updating). BRANCH=none BUG=chrome-os-partner:52431 TEST=Book elm-rev1 Change-Id: Ib106924418b16388ea8ea53c7b6bda6ef92e1d09 Signed-off-by: Nicolas Boichat <drinkcat@google.com> Reviewed-on: https://chromium-review.googlesource.com/345761 Commit-Ready: Nicolas Boichat <drinkcat@chromium.org> Tested-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-by: Randall Spangler <rspangler@google.com>