sb/intel/i82801gx: Use macro instead of numbers

Change-Id: Ide6516937ea79c35cd54127ed2823352a1cac6d4
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41611
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/intel/i82801gx/ac97.c b/src/southbridge/intel/i82801gx/ac97.c
index 175b5cd..67426c7 100644
--- a/src/southbridge/intel/i82801gx/ac97.c
+++ b/src/southbridge/intel/i82801gx/ac97.c
@@ -4,6 +4,7 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
+#include <device/pci_def.h>
 #include <arch/io.h>
 #include <device/pci_ops.h>
 #include <delay.h>
@@ -96,7 +97,7 @@
 
 static void program_sigid(struct device *dev, u32 id)
 {
-	pci_write_config32(dev, 0x2c, id);
+	pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID, id);
 }
 
 static void ac97_audio_init(struct device *dev)