autoport: Include 'default_irq_route.asl' into DSDT

After commit with Change-Id Ia1839ed3 (sandy/ivy: Include
IRQ routes from platform), update autoport to include
that file into the DSDT.

Change-Id: I14534438d0b433895f384539c8b413eaa53d943a
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/10612
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

util/autoport/bd82x6x.go

@@ -273,6 +273,8 @@ func (b bd82x6x) Scan(ctx Context, addr PCIDevData) {
 	})
 	DSDTPCI0Includes = append(DSDTPCI0Includes, DSDTInclude{
 		File: "southbridge/intel/bd82x6x/acpi/pch.asl",
+	}, DSDTInclude{
+		File: "southbridge/intel/bd82x6x/acpi/default_irq_route.asl",
 	})
 
 	sb := Create(ctx, "early_southbridge.c")