ARM: dts: aspeed: witherspoon: Set alternate boot

Set watchdog 2 to boot from the alternate flash chip when the watchdog
timer expires and the system is reset. This enables "brick protection."
Signed-off-by: NEddie James <eajames@linux.vnet.ibm.com>
Signed-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts

@@ -575,6 +575,10 @@
 	pinctrl-0 = <&pinctrl_wdtrst1_default>;
 };
 
+&wdt2 {
+	aspeed,alt-boot;
+};
+
 &ibt {
 	status = "okay";
 };