soc/intel/cannonlake: Enable FSP to use coreboot stack for cometlake

soc/intel/cannonlake: Enable FSP to use coreboot stack for cometlake

FSP v1263 for CML supports FSP to use coreboot stack. This change
selects common stack  config, that enables coreboot to support
share stack with FSP.

BUG=b:133398276

Change-Id: I4098a4374363ca6f3c86c396d097f9eabc9a28fe
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34130
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>