soc/intel: Rename some SMM support functions

Rename southbridge_smm_X to smm_southbridge_X.
Rename most southcluster_smm_X to smm_southbridge_X.

Change-Id: I4f6f9207ba32cf51d75b9ca9230e38310a33a311
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34856
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/haswell/smmrelocate.c

@@ -25,6 +25,7 @@
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/smm.h>
 #include <cpu/intel/em64t101_save_state.h>
+#include <cpu/intel/smm_reloc.h>
 #include <console/console.h>
 #include <northbridge/intel/haswell/haswell.h>
 #include <southbridge/intel/lynxpoint/pch.h>
@@ -325,7 +326,7 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 void smm_initialize(void)
 {
 	/* Clear the SMM state in the southbridge. */
-	southbridge_smm_clear_state();
+	smm_southbridge_clear_state();
 
 	/*
 	 * Run the relocation handler for on the BSP to check and set up