platform/x86: ISST: Add Clearwater Forest to support list

Add Clearwater Forest (INTEL_ATOM_DARKMONT_X) to SST support list by
adding to isst_cpu_ids.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20250103155255.1488139-2-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: spandruvada

drivers/platform/x86/intel/speed_select_if/isst_if_common.c

@@ -804,6 +804,7 @@ EXPORT_SYMBOL_GPL(isst_if_cdev_unregister);
 static const struct x86_cpu_id isst_cpu_ids[] = {
 	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT,	SST_HPM_SUPPORTED),
 	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X,	SST_HPM_SUPPORTED),
+	X86_MATCH_VFM(INTEL_ATOM_DARKMONT_X,	SST_HPM_SUPPORTED),
 	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X,	0),
 	X86_MATCH_VFM(INTEL_GRANITERAPIDS_D,	SST_HPM_SUPPORTED),
 	X86_MATCH_VFM(INTEL_GRANITERAPIDS_X,	SST_HPM_SUPPORTED),