cpu/x86/mp_init: drop unused MAX_APIC_IDS define

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I599e26a40ab584232614440612e95c91a698df27
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67775
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

src/cpu/x86/mp_init.c

@@ -26,8 +26,6 @@
 
 #include <security/intel/stm/SmmStm.h>
 
-#define MAX_APIC_IDS 256
-
 struct mp_callback {
 	void (*func)(void *);
 	void *arg;