cpu/x86: Move some SMM function declarations

Change-Id: I9a4e57f8fd032f2824eab0e5b59d635710e3e24b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34822
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/southbridge/intel/i82801dx/smi.c b/src/southbridge/intel/i82801dx/smi.c
index 7dfed9d..521b98d 100644
--- a/src/southbridge/intel/i82801dx/smi.c
+++ b/src/southbridge/intel/i82801dx/smi.c
@@ -23,6 +23,7 @@
 #include <device/pci_ops.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/smm.h>
+#include <cpu/x86/smi_deprecated.h>
 #include <string.h>
 #include "i82801dx.h"