ipmi: bt: Add ast2600 compatible string

The AST2600 has the same register set as the previous generation SoCs.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Message-Id: <20210903015314.177987-1-joel@jms.id.au>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt

@@ -9,6 +9,7 @@ Required properties:
 - compatible : should be one of
 	"aspeed,ast2400-ibt-bmc"
 	"aspeed,ast2500-ibt-bmc"
+	"aspeed,ast2600-ibt-bmc"
 - reg: physical address and size of the registers
 
 Optional properties:

drivers/char/ipmi/bt-bmc.c

@@ -472,6 +472,7 @@ static int bt_bmc_remove(struct platform_device *pdev)
 static const struct of_device_id bt_bmc_match[] = {
 	{ .compatible = "aspeed,ast2400-ibt-bmc" },
 	{ .compatible = "aspeed,ast2500-ibt-bmc" },
+	{ .compatible = "aspeed,ast2600-ibt-bmc" },
 	{ },
 };