soc/intel/xeon_sp: Drop uncore_fill_ssdt

soc/intel/xeon_sp: Drop uncore_fill_ssdt

Let ACPI DSDT figure out by itself if a stack is enabled.
Allows to drop uncore_fill_ssdt() on all platforms.

TEST=intel/archercity CRB

Change-Id: Ib9051d608147f2de228509ff6b13871ca3183979
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81273
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>