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/pcie.c b/src/southbridge/intel/i82801gx/pcie.c
index 56cf1f2..7a49e52 100644
--- a/src/southbridge/intel/i82801gx/pcie.c
+++ b/src/southbridge/intel/i82801gx/pcie.c
@@ -50,7 +50,7 @@
 
 	/* Set Cache Line Size to 0x10 */
 	// This has no effect but the OS might expect it
-	pci_write_config8(dev, 0x0c, 0x10);
+	pci_write_config8(dev, PCI_CACHE_LINE_SIZE, 0x10);
 
 	reg16 = pci_read_config16(dev, PCI_BRIDGE_CONTROL);
 	reg16 &= ~PCI_BRIDGE_CTL_PARITY;