ARM: dts: aspeed: vesnin: Add wdt2 with alt-boot option

Adds wdt2 section with 'alt-boot' option into dts for vesnin.
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -222,3 +222,7 @@ &i2c13 {
 &vuart {
 	status = "okay";
 };
+
+&wdt2 {
+	aspeed,alt-boot;
+};