mb/emulation/qemu-q35: Split smm_close() and smm_lock()

Change-Id: I6d8efe783e6cc5413c3fd0583574a075a2c3876b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69667
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/include/cpu/intel/smm_reloc.h

@@ -36,7 +36,8 @@ struct ied_header {
 /* These helpers are for performing SMM relocation. */
 void northbridge_write_smram(u8 smram);
 
-void smm_open_aseg(void);
+void smm_close(void);
+void smm_open(void);
 void smm_lock(void);
 void smm_relocate(void);