I82801JX: Add IS_ENABLED around config options

This chipset was just added and had a few places that needed to be
fixed.

Change-Id: Ief048c4876c5a2cb538c9cb4b295aba46a4fff62
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20684
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/southbridge/intel/i82801jx/i82801jx.c b/src/southbridge/intel/i82801jx/i82801jx.c
index dca3a41..644524d 100644
--- a/src/southbridge/intel/i82801jx/i82801jx.c
+++ b/src/southbridge/intel/i82801jx/i82801jx.c
@@ -222,7 +222,7 @@
 	i82801jx_hide_functions();
 
 	/* Reset watchdog timer. */
-#if !CONFIG_HAVE_SMI_HANDLER
+#if !IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)
 	outw(0x0008, DEFAULT_TCOBASE + 0x12); /* Set higher timer value. */
 #endif
 	outw(0x0000, DEFAULT_TCOBASE + 0x00); /* Update timer. */