soc/amd/cezanne: include LAPIC code and set MAX_CPUS to 16

Change-Id: I97c73324900a0677165afa3f5b182a336d534968
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49730
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>

src/soc/amd/cezanne/Kconfig

@@ -108,6 +108,10 @@ config MMCONF_BUS_NUMBER
 	int
 	default 64
 
+config MAX_CPUS
+	int
+	default 16
+
 config CONSOLE_UART_BASE_ADDRESS
 	depends on CONSOLE_SERIAL && AMD_SOC_CONSOLE_UART
 	hex

src/soc/amd/cezanne/Makefile.inc

@@ -2,6 +2,7 @@
 
 ifeq ($(CONFIG_SOC_AMD_CEZANNE),y)
 
+subdirs-y += ../../../cpu/x86/lapic
 subdirs-y += ../../../cpu/x86/mtrr
 
 # Beware that all-y also adds the compilation unit to verstage on PSP