Fix bad dtb in its

Author: Daniel Rossier

target/virt64_capsule.its

@@ -36,7 +36,7 @@
 
         fdt {
 			description = "Flattened Device Tree blob";
-			data = /incbin/("../so3/dts/virt64_guest.dtb");
+			data = /incbin/("../so3/dts/virt64_capsule.dtb");
 			type = "flat_dt";
 			arch = "arm64";
 			compression = "none";