soc/intel/xeon_sp/spr: Print return codes for mp_init_with_smm

TEST=Build and boot on intel/archercity CRB

Change-Id: Iee2234a3055fe8a94ecbfc820e9ff9e981f8dff2
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82195
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/xeon_sp/spr/cpu.c

@@ -270,6 +270,7 @@ void mp_init_cpus(struct bus *bus)
 	microcode_patch = intel_microcode_find();
 	intel_microcode_load_unlocked(microcode_patch);
 
-	if (mp_init_with_smm(bus, &mp_ops) < 0)
-		printk(BIOS_ERR, "MP initialization failure.\n");
+	enum cb_err ret = mp_init_with_smm(bus, &mp_ops);
+	if (ret < 0)
+		printk(BIOS_ERR, "MP initialization failure %d.\n", ret);
 }