SMM: rename tseg_fixup to tseg_relocate and export

This function is exported so it can be used in other
places that need similar relocation due to TSEG.

Change-Id: I68b78ca32d58d1a414965404e38d71977c3da347
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1310
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/cpu/x86/smm.h

@@ -376,9 +376,12 @@ void __attribute__((weak)) mainboard_smi_sleep(u8 slp_typ);
 
 #if !CONFIG_SMM_TSEG
 void smi_release_lock(void);
+#define tseg_relocate(ptr)
 #else
 /* Return address of TSEG base */
 u32 smi_get_tseg_base(void);
+/* Adjust pointer with TSEG base */
+void tseg_relocate(void **ptr);
 #endif
 
 #endif