sb/intel: Clean up some SMI enables

Change-Id: I191ad709fd3c6f906cd34b0053eeaebdb80d410d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42354
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/southbridge/intel/i82801dx/smi.c b/src/southbridge/intel/i82801dx/smi.c
index 3bcde6c..d7a02ef 100644
--- a/src/southbridge/intel/i82801dx/smi.c
+++ b/src/southbridge/intel/i82801dx/smi.c
@@ -261,18 +261,10 @@
 	 */
 
 	smi_en = 0; /* reset SMI enables */
-
-#if 0
-	smi_en |= LEGACY_USB2_EN | LEGACY_USB_EN;
-#endif
 	smi_en |= TCO_EN;
 	smi_en |= APMC_EN;
-#if DEBUG_PERIODIC_SMIS
-	/* Set DEBUG_PERIODIC_SMIS in i82801gx.h to debug using
-	 * periodic SMIs.
-	 */
-	smi_en |= PERIODIC_EN;
-#endif
+	if (CONFIG(DEBUG_PERIODIC_SMI))
+		smi_en |= PERIODIC_EN;
 	smi_en |= SLP_SMI_EN;
 	smi_en |= BIOS_EN;