soc/intel/common: Add SMM common code for Intel Platforms

SMI code is very similar across Intel platforms. Move this code to
common/block/smi to allow it to be shared between platforms instead
of duplicating the code for each platform. smihandler.h has already
been made common so all it will contain is name changes and a move
to the common block location. Due to moving smihandler code, APL
changes are bundled here to show this change.

Change-Id: I599358f23d5de7564ef1ca414bccd54cebab5a4c
Signed-off-by: Brandon Breitenstein <brandon.breitenstein@intel.com>
Reviewed-on: https://review.coreboot.org/19392
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/memmap.c

@@ -27,9 +27,9 @@
 #include <assert.h>
 #include <cbmem.h>
 #include <device/pci.h>
+#include <fsp/memmap.h>
 #include <soc/systemagent.h>
 #include <soc/pci_devs.h>
-#include <soc/smm.h>
 
 static uintptr_t smm_region_start(void)
 {