ppc/pnv.c: fix "system-id" FDT when -uuid is set

Setting -uuid in the pnv machine does not work:

./qemu-system-ppc64 -machine powernv8,accel=tcg  -uuid 7ff61ca1-a4a0-4bc1-944c-abd114a35e80
qemu-system-ppc64: error creating device tree: (fdt_property_string(fdt, "system-id", buf)): FDT_ERR_BADSTATE

This happens because we're using fdt_property_string(), which is a
sequential write function that is supposed to be used when we're
building a new FDT, in a case where read/writing into an existing FDT.

Fix it by using fdt_setprop_string() instead.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20211207094858.744386-1-danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/ppc/pnv.c

@@ -522,7 +522,7 @@ static void *pnv_dt_create(MachineState *machine)
     buf =  qemu_uuid_unparse_strdup(&qemu_uuid);
     _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
     if (qemu_uuid_set) {
-        _FDT((fdt_property_string(fdt, "system-id", buf)));
+        _FDT((fdt_setprop_string(fdt, 0, "system-id", buf)));
     }
     g_free(buf);