Dedede: Enable 3.0A sourcing
Dedede: Enable 3.0A sourcing

Enables sourcing of 3.0A to a single port, and also activates the charge
manager code which will manage setting current limit values per port.

BRANCH=None
BUG=b:153906171
TEST=on waddledee, DB can source out 3.0A to a dongle when nothing is
connected on the MB

Signed-off-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Change-Id: I2a44771ff869602ede1dba8493314e811fc556af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2151645
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

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