zephyr: don't make ec_features.c depend on ACPI
zephyr: don't make ec_features.c depend on ACPI

ACPI is a concept of the x86 world only, but ARM devices require
ec_features.c as well.

Compile ec_features.c under the common CONFIG_PLATFORM_EC option.

BUG=b:182398910
BRANCH=none
TEST=compile lazor with host commands

Signed-off-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Change-Id: Ic06d6ed26015de9ef7e26f6f5554ac3fb4e92f47
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2749423
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