fix(ble/bluedroid): Add length check in prepare write response

(cherry picked from commit b03ff3cf218c3974b798a700cf1ede95641fe7af)

Co-authored-by: zhanghaipeng <zhanghaipeng@espressif.com>

components/bt/host/bluedroid/stack/smp/include/smp_int.h

@@ -197,7 +197,7 @@ enum {
 };
 typedef UINT8 tSMP_BR_STATE;
 
-/* random and encrption activity state */
+/* random and encryption activity state */
 enum {
     SMP_GEN_COMPARE = 1,
     SMP_GEN_CONFIRM,
@@ -363,6 +363,9 @@ extern tSMP_CB *smp_cb_ptr;
 /* Functions provided by att_main.c */
 extern void smp_init (void);
 
+/* SMP command sizes per spec - defined in smp_utils.c */
+extern const UINT8 smp_cmd_size_per_spec[];
+
 /* smp main */
 extern void smp_sm_event(tSMP_CB *p_cb, tSMP_EVENT event, void *p_data);