cpu/x86/smm: Promote smm_subregion()

No need to limit these declarations to FSP. Both
PARALLEL_MP_INIT smm_relocate() and TSEG_STAGE_CACHE
can be built on top of this.

Change-Id: I7b0b9b8c8bee03aabe251c50c47dc42f6596e169
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34701
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/soc/intel/braswell/cpu.c b/src/soc/intel/braswell/cpu.c
index 5f86a11..bde4b1c 100644
--- a/src/soc/intel/braswell/cpu.c
+++ b/src/soc/intel/braswell/cpu.c
@@ -26,7 +26,6 @@
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/smm.h>
-#include <fsp/memmap.h>
 #include <reg_script.h>
 #include <soc/iosf.h>
 #include <soc/msr.h>
diff --git a/src/soc/intel/braswell/memmap.c b/src/soc/intel/braswell/memmap.c
index a4692ce..69bbe58 100644
--- a/src/soc/intel/braswell/memmap.c
+++ b/src/soc/intel/braswell/memmap.c
@@ -15,7 +15,7 @@
  */
 
 #include <cbmem.h>
-#include <fsp/memmap.h>
+#include <cpu/x86/smm.h>
 #include <soc/iosf.h>
 #include <soc/smm.h>
 
diff --git a/src/soc/intel/braswell/northcluster.c b/src/soc/intel/braswell/northcluster.c
index 9267448..e37e0d6 100644
--- a/src/soc/intel/braswell/northcluster.c
+++ b/src/soc/intel/braswell/northcluster.c
@@ -21,8 +21,8 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
-#include <fsp/memmap.h>
 #include <cpu/x86/lapic.h>
+#include <cpu/x86/smm.h>
 #include <fsp/util.h>
 #include <soc/iomap.h>
 #include <soc/iosf.h>