irqchip/aspeed-vic: Add AST2500 compatible string

In addition to introducing the new compatible string the bindings
description is reworked to be more generic.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/drivers/irqchip/irq-aspeed-vic.c b/drivers/irqchip/irq-aspeed-vic.c
index 88e139e..03ba477 100644
--- a/drivers/irqchip/irq-aspeed-vic.c
+++ b/drivers/irqchip/irq-aspeed-vic.c
@@ -227,4 +227,5 @@ static int __init avic_of_init(struct device_node *node,
 	return 0;
 }
 
-IRQCHIP_DECLARE(aspeed_new_vic, "aspeed,ast2400-vic", avic_of_init);
+IRQCHIP_DECLARE(ast2400_vic, "aspeed,ast2400-vic", avic_of_init);
+IRQCHIP_DECLARE(ast2500_vic, "aspeed,ast2500-vic", avic_of_init);