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This commit adds a basic driver for the TI SN5S330. This driver just sets up the IC and provides an API to turn on or off the PP2 FET. BUG=b:67663166, b:67663124 BRANCH=None TEST=Enable code for zoombini; Flash a board which has the SN5S330 stuffed; Verify that we're able to perform PD negotiation and negotiate all the way up to 20V. TEST=Boot only on AC. sysjump to RW, verify that board does not brownout. Change-Id: I9c147ee8465eed878843cf902db301d62e8f627e Signed-off-by: Aseda Aboagye <aaboagye@google.com> Reviewed-on: https://chromium-review.googlesource.com/722104 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>