{src/mb,util/autoport}: Use macro for DSDT revision

Change-Id: I5a5f4e7067948c5cc7a715a08f7a5a3e9b391191
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45904
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

util/autoport/main.go

@@ -833,7 +833,7 @@ func main() {
 DefinitionBlock(
 	"dsdt.aml",
 	"DSDT",
-	0x02,		/* DSDT revision: ACPI 2.0 and up */
+	ACPI_DSDT_REV_2,
 	OEM_ID,
 	ACPI_TABLE_CREATOR,
 	0x20141018	/* OEM revision */