soc/intel/common: Replace smm_soutbridge_enable(SMI_FLAGS)

Change-Id: I8c4dc5ab91891de9737189bd7ae86df18d86f758
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41960
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/include/cpu/intel/smm_reloc.h

@@ -44,7 +44,6 @@ void smm_relocate(void);
  * SMIs. They are split so that other work between the 2 actions. */
 void smm_southbridge_clear_state(void);
 void smm_southbridge_enable_smi(void);
-void smm_southbridge_enable(uint16_t pm1_events);
 
 /* To be removed. */
 void smm_initialize(void);