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/soc/amd/picasso/smi.c

@@ -19,6 +19,7 @@
  */
 
 #include <console/console.h>
+#include <cpu/x86/smm.h>
 #include <amdblocks/acpimmio.h>
 #include <soc/southbridge.h>
 #include <soc/smi.h>

src/soc/amd/stoneyridge/smi.c

@@ -19,6 +19,7 @@
  */
 
 #include <console/console.h>
+#include <cpu/x86/smm.h>
 #include <amdblocks/acpimmio.h>
 #include <soc/southbridge.h>
 #include <soc/smi.h>