cpu/x86: Move smm_lock() prototype

The function implementations are in local platform
scopes.

Change-Id: I7a3025398b15fe6d2c5a13cdb65f3e62a49c0bc6
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34151
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/include/soc/smm.h

@@ -59,6 +59,7 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 		size_t *smm_save_state_size);
 void smm_initialize(void);
 void smm_relocate(void);
+void smm_lock(void);
 
 /* These helpers are for performing SMM relocation. */
 void southbridge_trigger_smi(void);

src/soc/intel/cannonlake/include/soc/smm.h

@@ -56,5 +56,6 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 		size_t *smm_save_state_size);
 void smm_initialize(void);
 void smm_relocate(void);
+void smm_lock(void);
 
 #endif

src/soc/intel/fsp_broadwell_de/include/soc/smm.h

@@ -60,6 +60,7 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 		size_t *smm_save_state_size);
 void smm_initialize(void);
 void smm_relocate(void);
+void smm_lock(void);
 
 /* These helpers are for performing SMM relocation. */
 void southbridge_trigger_smi(void);

src/soc/intel/icelake/include/soc/smm.h

@@ -55,5 +55,6 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 		size_t *smm_save_state_size);
 void smm_initialize(void);
 void smm_relocate(void);
+void smm_lock(void);
 
 #endif

src/soc/intel/skylake/include/soc/smm.h

@@ -54,5 +54,6 @@ void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 		size_t *smm_save_state_size);
 void smm_initialize(void);
 void smm_relocate(void);
+void smm_lock(void);
 
 #endif