mb/*: Use ACPI_DSDT_REV_2 instead of hard-coded value

Change-Id: I6c5b86c348386aa17ee42bdaf34aa388fe6207f9
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47839
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/src/mainboard/kontron/bsl6/dsdt.asl b/src/mainboard/kontron/bsl6/dsdt.asl
index 225c8a5..3be5115 100644
--- a/src/mainboard/kontron/bsl6/dsdt.asl
+++ b/src/mainboard/kontron/bsl6/dsdt.asl
@@ -4,7 +4,7 @@
 DefinitionBlock(
 	"dsdt.aml",
 	"DSDT",
-	0x02,
+	ACPI_DSDT_REV_2,
 	OEM_ID,
 	ACPI_TABLE_CREATOR,
 	0x20110725
diff --git a/src/mainboard/siemens/chili/dsdt.asl b/src/mainboard/siemens/chili/dsdt.asl
index 6fd12b1..9b49942 100644
--- a/src/mainboard/siemens/chili/dsdt.asl
+++ b/src/mainboard/siemens/chili/dsdt.asl
@@ -4,7 +4,7 @@
 DefinitionBlock(
 	"dsdt.aml",
 	"DSDT",
-	0x02,		// DSDT revision: ACPI v2.0 and up
+	ACPI_DSDT_REV_2,
 	OEM_ID,
 	ACPI_TABLE_CREATOR,
 	0x20110725	// OEM revision