spapr: Add /ibm,partition-name

QEMU has a notion of the guest name, so if it's present we might as
well put that into the device tree as /ibm,partition-name.

This is specificed by PAPR.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr.c

@@ -375,6 +375,11 @@ static void *spapr_create_fdt_skel(hwaddr initrd_base,
     _FDT((fdt_property_string(fdt, "vm,uuid", buf)));
     g_free(buf);
 
+    if (qemu_get_vm_name()) {
+        _FDT((fdt_property_string(fdt, "ibm,partition-name",
+                                  qemu_get_vm_name())));
+    }
+
     _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
     _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));