soc,southbridge/intel: Avoid preprocessor with HAVE_SMI_HANDLER

Change-Id: Id375999adad71d95d4968398e90bc3c07f65ea83
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34254
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/cpu.c

@@ -487,9 +487,8 @@ static void post_mp_init(void)
 	smm_southbridge_enable(GBL_EN);
 
 	/* Lock down the SMRAM space. */
-#if CONFIG(HAVE_SMI_HANDLER)
-	smm_lock();
-#endif
+	if (CONFIG(HAVE_SMI_HANDLER))
+		smm_lock();
 
 	mp_run_on_all_cpus(vmx_configure, NULL, 2 * USECS_PER_MSEC);