Zephyr: Allow S0ix to be configured on non-Intel boards
Zephyr: Allow S0ix to be configured on non-Intel boards

Boards besides Intel may allow S0ix, so move that configuration out of
the Intel-specific section of the power sequencing Kconfig.

BRANCH=None
BUG=b:234499465
TEST=zmake testall

Signed-off-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Change-Id: I05ce493aeed002576809dc6fc45997ca47d6bcae
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3693866
Commit-Queue: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

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