soc/amd/cezanne: add config.c and minimal chip.h

Change-Id: I89f08c201bd7d9a11b186ef960abe9714a76fb97
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48317
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/cezanne/chip.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <device/device.h>
+#include "chip.h"
 
 struct chip_operations soc_amd_cezanne_ops = { NULL };