AMD: Add fake S0 support
AMD: Add fake S0 support

Add in support for a fake S0 state.  Since we rely on the SoC SLP
signals to sequence, we can encourage sequencing through just turning
these GPIOs into outputs and setting them.  Disable the forced power
sequencing by setting them to inputs again.

BRANCH=None
BUG=b:209613841
TEST=make buildall

Signed-off-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Change-Id: I30a07b9accdd5632fa303e05ac12201f3f86cfb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3430301
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