sb/intel/i82801ix: Fix SPDX license header

Change-Id: I4c8ef49f86f6d5344741ab92035e108cccfe30b1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42294
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/southbridge/intel/i82801ix/smi.c

@@ -1,7 +1,4 @@
-/*
+/* SPDX-License-Identifier: GPL-2.0-only */
- *
- *               2012 secunet Security Networks AG SPDX-License-Identifier: GPL-2.0-only */
-
 
 #include <device/device.h>
 #include <device/pci.h>