src: use ARRAY_SIZE where possible

Generated with a variant of
https://coccinelle.gitlabpages.inria.fr/website/rules/array.cocci

Change-Id: I083704fd48faeb6c67bba3367fbcfe554a9f7c66
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50594
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/x86/smm/smm_module_loaderv2.c

@@ -129,7 +129,7 @@ static int smm_create_map(uintptr_t smbase, unsigned int num_cpus,
 		return 0;
 	}
 
-	if (sizeof(cpus) / sizeof(struct cpu_smm_info) < num_cpus) {
+	if (ARRAY_SIZE(cpus) < num_cpus) {
 		printk(BIOS_ERR,
 			"%s: increase MAX_CPUS in Kconfig\n", __func__);
 		return 0;