cpu/x86/mp_init.c: Set a bogus initial lapic_id

This makes it easier to catch errors later if the ap_init code fails to
properly set things up.

Change-Id: I938faf042bfa4fe1fc39e78ab740c9b210bc105c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69108
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index e3b294f..8cd785e 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -375,9 +375,11 @@
 		/* Build the CPU device path */
 		cpu_path.type = DEVICE_PATH_APIC;
 
-		/* Assuming linear APIC space allocation. AP will set its own
-		   APIC id in the ap_init() path above. */
-		cpu_path.apic.apic_id = info->cpu->path.apic.apic_id + i;
+		/*
+		 * Set a bogus apic_id.
+		 * AP will set its own APIC id in the ap_init() path above.
+		 */
+		cpu_path.apic.apic_id = UINT32_MAX;
 
 		/* Allocate the new CPU device structure */
 		new = alloc_find_dev(cpu_bus, &cpu_path);