mb: Set coreboot as DSDT's manufacturer model ID

Field 'OEMID' & "OEM Table ID" are related to DSDT table
not to mainboard.
So use macro to set them respectvely to "COREv4" and
"COREBOOT".

Change-Id: I060e07a730e721df4a86128ee89bfe168c69f31e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/29790
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: David Guckian
diff --git a/src/mainboard/pcengines/apu2/dsdt.asl b/src/mainboard/pcengines/apu2/dsdt.asl
index 03bd33e..3bf0ed6 100644
--- a/src/mainboard/pcengines/apu2/dsdt.asl
+++ b/src/mainboard/pcengines/apu2/dsdt.asl
@@ -15,12 +15,13 @@
  */
 
 /* DefinitionBlock Statement */
+#include <arch/acpi.h>
 DefinitionBlock (
 	"DSDT.AML",	/* Output filename */
 	"DSDT",		/* Signature */
 	0x02,		/* DSDT Revision, needs to be 2 for 64bit */
-	"AMD   ",	/* OEMID */
-	"COREBOOT",	/* TABLE ID */
+	OEM_ID,
+	ACPI_TABLE_CREATOR,
 	0x00010001	/* OEM Revision */
 	)
 {	/* Start of ASL file */