i82801gx: replace cafed00d/cafebabe by defines

We're using '0xcafed00d' all over the code as magic for ACPI S3
resume. Let's add a define for that. Also replace 0xcafebabe by
a define.

Change-Id: I5f5dc09561679d19f98771c4f81830a50202c69f
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/33
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/mainboard/lenovo/x60/mainboard.c b/src/mainboard/lenovo/x60/mainboard.c
index d5c9d95..8cd68bc 100644
--- a/src/mainboard/lenovo/x60/mainboard.c
+++ b/src/mainboard/lenovo/x60/mainboard.c
@@ -47,7 +47,7 @@
 
 	/* If we're resuming from suspend, blink suspend LED */
 	dev0 = dev_find_slot(0, PCI_DEVFN(0,0));
-	if (dev0 && pci_read_config32(dev0, SKPAD) == 0xcafed00d)
+	if (dev0 && pci_read_config32(dev0, SKPAD) == SKPAD_ACPI_S3_MAGIC)
 		ec_write(0x0c, 0xc7);
 
 	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));