irqchip/sifive-plic: Improve boot prints for multiple PLIC instances

We improve PLIC banner to help distinguish multiple PLIC instances
in boot time prints.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Link: https://lore.kernel.org/r/20200518091441.94843-4-anup.patel@wdc.com

drivers/irqchip/irq-sifive-plic.c

@@ -380,8 +380,8 @@ done:
 		plic_cpuhp_setup_done = true;
 	}
 
-	pr_info("mapped %d interrupts with %d handlers for %d contexts.\n",
-		nr_irqs, nr_handlers, nr_contexts);
+	pr_info("%pOFP: mapped %d interrupts with %d handlers for"
+		" %d contexts.\n", node, nr_irqs, nr_handlers, nr_contexts);
 	set_handle_irq(plic_handle_irq);
 	return 0;