Revert "model_206ax: Use parallel MP init"

This reverts commit 5fbe788bae.
This commit was submitted without its parent being submitted,
resulting in coreboot not building.

Change-Id: I87497093ccf6909b88e3a40d5f472afeb7f2c552
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/25616
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/cpu/intel/smm/gen1/smi.h

@@ -11,10 +11,6 @@
  * GNU General Public License for more details.
  */
 
-#include <device/device.h>
-
-void bsp_init_and_start_aps(struct bus *cpu_bus);
-
 /* These helpers are for performing SMM relocation. */
 void southbridge_smm_init(void);
 void southbridge_trigger_smi(void);
@@ -22,10 +18,3 @@ void southbridge_clear_smi_status(void);
 u32 northbridge_get_tseg_base(void);
 int cpu_get_apic_id_map(int *apic_id_map);
 void northbridge_write_smram(u8 smram);
-void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
-		size_t *smm_save_state_size);
-void smm_initialize(void);
-void southbridge_smm_clear_state(void);
-void smm_relocation_handler(int cpu, uintptr_t curr_smbase,
-			uintptr_t staggered_smbase);
-void smm_relocate(void);