arch/x86: Create helper for APM_CNT SMI triggers

Attempts to write to APM_CNT IO port should always be guarded
with a test to verify SMI handler has been installed.

Immediate followup removes redundant HAVE_SMI_HANDLER tests.

Change-Id: If3fb0f1a8b32076f1d9f3fea9f817dd4b093ad98
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41971
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/cannonlake/finalize.c

@@ -101,9 +101,7 @@ static void soc_finalize(void *unused)
 	printk(BIOS_DEBUG, "Finalizing chipset.\n");
 
 	pch_finalize();
-
-	printk(BIOS_DEBUG, "Finalizing SMM.\n");
-	outb(APM_CNT_FINALIZE, APM_CNT);
+	apm_control(APM_CNT_FINALIZE);
 
 	/* Indicate finalize step with post code */
 	post_code(POST_OS_BOOT);