hw/ppc/spapr: Add POWER9 to pseries cpu models

Add POWER9 cpu to list of spapr core models which allows it to be specified
as the cpu model for a pseries guest (e.g. -machine pseries -cpu POWER9).

This now allows a POWER9 cpu to boot to userspace in tcg emulation for a
pseries machine with a legacy kernel.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr_cpu_core.c

@@ -238,6 +238,9 @@ static const char *spapr_core_models[] = {
 
     /* POWER8NVL */
     "POWER8NVL_v1.0",
+
+    /* POWER9 */
+    "POWER9_v1.0",
 };
 
 void spapr_cpu_core_class_init(ObjectClass *oc, void *data)