soc/amd/cezanne: add basic MCA support

Currently the MCA support for Cezanne only clears the MCA status
registers. The MCA error handling and BERT table generation will be
added in subsequent patches.

Change-Id: Ib9b5174186c28c8c82f57ffd8936c8dad4e63c5b
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56262
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/cezanne/cpu.c

@@ -59,6 +59,7 @@ void mp_init_cpus(struct bus *cpu_bus)
 
 static void zen_2_3_init(struct device *dev)
 {
+	check_mca();
 	setup_lapic();
 	set_cstate_io_addr();