cpu/x86/mp_init: use cb_err as mp_init_with_smm return type

Using cb_err as return type clarifies the meaning of the different
return values. This patch also adds the types.h include that provides
the definition of the cb_err enum and checks the return value of
mp_init_with_smm against the enum values instead of either checking if
it's non-zero or less than zero to handle the error case.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ibcd4a9a63cc87fe176ba885ced0f00832587d492
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58491
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/soc/intel/alderlake/cpu.c b/src/soc/intel/alderlake/cpu.c
index 801d10d..a437559 100644
--- a/src/soc/intel/alderlake/cpu.c
+++ b/src/soc/intel/alderlake/cpu.c
@@ -23,6 +23,7 @@
 #include <soc/msr.h>
 #include <soc/pci_devs.h>
 #include <soc/soc_chip.h>
+#include <types.h>
 
 static void soc_fsp_load(void)
 {
@@ -126,7 +127,7 @@
 
 void soc_init_cpus(struct bus *cpu_bus)
 {
-	if (mp_init_with_smm(cpu_bus, &mp_ops))
+	if (mp_init_with_smm(cpu_bus, &mp_ops) != CB_SUCCESS)
 		printk(BIOS_ERR, "MP initialization failure.\n");
 
 	/* Thermal throttle activation offset */