soc/amd/cezanne: add empty mp_init_cpus

Change-Id: I845a7e2cfea58ca08cd2a6f0d884dbbbe1a7bdef
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50483
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/cezanne/cpu.c

@@ -7,6 +7,10 @@
 #include <device/device.h>
 #include <soc/cpu.h>
 
+void mp_init_cpus(struct bus *cpu_bus)
+{
+}
+
 static void zen_2_3_init(struct device *dev)
 {
 	setup_lapic();