CHERRY-PICK: nocturne: Enable active discharge on 1.8U and 1.2U
CHERRY-PICK: nocturne: Enable active discharge on 1.8U and 1.2U

PP1200_VDDQ and PP1800_U_DRAM don't fall all the way to 0 volts, however
we can use the PMIC's active discharge to help drive it there.  This
commit enables a 500 ohm discharge on 1.8U and 100 ohm discharge on
1.2U.

BUG=b:114396893
BRANCH=firmware-nocturne-10984.B
TEST=Flash nocturne; measure PP1200_VDDQ and PP1800_U_DRAM and verify
that they both go to 0 volts after an EC reset and also have a 200mV
margin between the two rails.

Signed-off-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1239549
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Tested-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Furquan Shaikh <6be5c96c464778f89679b1062a2e0a6af93d2aa5@chromium.org>
Change-Id: I9e8735b252c85c359000d261da31c4d7d9cf872b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2157058
Tested-by: Patryk Duda <6aed17a362577cf10cb5675888c1635d522769c1@semihalf.com>
Commit-Queue: Patryk Duda <6aed17a362577cf10cb5675888c1635d522769c1@semihalf.com>
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