dratini: Reduce input voltage to 5V when battery full
dratini: Reduce input voltage to 5V when battery full

Apply CL:1401018 for dratini.

To reduce power consumption, reduce USB-C PD input voltage to 5V
when the battery is full and the system is off (S5/G3).

BUG=b:149890873
BRANCH=firmware-hatch-12672.B
TEST=battery 90%: chgsup shows 15V or 20V,
     when battery full: chgsup shows 5V,
     power on AP: chgsup shows 15V or 20V

Change-Id: Ifa013d8f696f69aeba587fa45c72413a42445728
Signed-off-by: Devin Lu <052fe648504800b810f29702ef4f3db83fad68bf@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2104813
Reviewed-by: Tim Wawrzynczak <86444811eee8c2cb29e29a251d7a069e64ccc665@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec