soc/amd/cezanne: add empty CPU driver

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I54299cadae4cb562e04a16c3b8e051c9c454db79
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50404
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/cezanne/Makefile.inc

@@ -25,6 +25,7 @@ romstage-y	+= romstage.c
 romstage-y	+= uart.c
 
 ramstage-y	+= chip.c
+ramstage-y	+= cpu.c
 ramstage-y	+= fch.c
 ramstage-y	+= fsp_params.c
 ramstage-y	+= gpio.c

src/soc/amd/cezanne/cpu.c

@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <cpu/cpu.h>
+#include <device/device.h>
+#include <soc/cpu.h>
+
+static void zen_2_3_init(struct device *dev)
+{
+}
+
+static struct device_operations cpu_dev_ops = {
+	.init = zen_2_3_init,
+};
+
+static struct cpu_device_id cpu_table[] = {
+	{ X86_VENDOR_AMD, CEZANNE_A0_CPUID},
+	{ 0, 0 },
+};
+
+static const struct cpu_driver zen_2_3 __cpu_driver = {
+	.ops      = &cpu_dev_ops,
+	.id_table = cpu_table,
+};