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>

src/cpu/amd/smm/smm_init.c

@@ -21,6 +21,7 @@
 #include <cpu/amd/msr.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/smm.h>
+#include <cpu/x86/smi_deprecated.h>
 #include <string.h>
 
 void smm_init(void)

src/cpu/x86/lapic/lapic_cpu_init.c

@@ -21,6 +21,7 @@
 #include <cpu/x86/cr.h>
 #include <cpu/x86/gdt.h>
 #include <cpu/x86/lapic.h>
+#include <cpu/x86/smi_deprecated.h>
 #include <arch/acpi.h>
 #include <delay.h>
 #include <halt.h>
@@ -590,14 +591,3 @@ void initialize_cpus(struct bus *cpu_bus)
 	if (is_smp_boot())
 		recover_lowest_1M();
 }
-
-#if !CONFIG(HAVE_SMI_HANDLER)
-/* Empty stubs for platforms without SMI handlers. */
-void smm_init(void)
-{
-}
-
-void smm_init_completion(void)
-{
-}
-#endif