cpu/intel/fsp_model_406dx: Invaild include path

Found-by: Clang
Change-Id: Iac54755caadc3ffbe8a09d40aed8500c2359e829
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7349
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>

src/cpu/intel/fsp_model_406dx/bootblock.c

@@ -25,7 +25,7 @@
 #include <cpu/x86/mtrr.h>
 #include <arch/io.h>
 #include <reset.h>
-#include <src/southbridge/intel/fsp_rangeley/soc.h>
+#include <southbridge/intel/fsp_rangeley/soc.h>
 
 #include "model_406dx.h"