Get rid of hard coded strings in ACPI tables

(cosmetical)

Change-Id: I3e01d8fbf2d71abcfcbe47efedd2184566c91df7
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1748
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/mainboard/amd/pistachio/fadt.c b/src/mainboard/amd/pistachio/fadt.c
index 2551247..b771f44 100644
--- a/src/mainboard/amd/pistachio/fadt.c
+++ b/src/mainboard/amd/pistachio/fadt.c
@@ -54,7 +54,7 @@
 	header->length = 244;
 	header->revision = 3;
 	memcpy(header->oem_id, OEM_ID, 6);
-	memcpy(header->oem_table_id, "COREBOOT", 8);
+	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;