Use the struct pdb_config for the int_n thread

lib/src/int_n.c

 /*
  * INT_N polling thread
  */
-static THD_WORKING_AREA(waIntNPoll, 128);
-static THD_FUNCTION(IntNPoll, arg) {
-    (void) arg;
+static THD_FUNCTION(IntNPoll, cfg) {
+    (void) cfg;
 
     union fusb_status status;
     eventmask_t events;
     }
 }
 
-void pdb_int_n_run(void)
+void pdb_int_n_run(struct pdb_config *cfg)
 {
-    chThdCreateStatic(waIntNPoll, sizeof(waIntNPoll), PDB_PRIO_PRL_INT_N,
-            IntNPoll, NULL);
+    cfg->int_n.thread = chThdCreateStatic(cfg->int_n._wa,
+            sizeof(cfg->int_n._wa), PDB_PRIO_PRL_INT_N, IntNPoll, cfg);
 }

lib/src/int_n.h

 #ifndef PDB_INT_N_OLD_H
 #define PDB_INT_N_OLD_H
 
+#include <pdb.h>
+
 
 /*
  * Start the INT_N polling thread
  */
-void pdb_int_n_run(void);
+void pdb_int_n_run(struct pdb_config *cfg);
 
 
 #endif /* PDB_INT_N_OLD_H */

lib/src/pdb.c

     pdb_hardrst_run(/*cfg*/);
 
     /* Create the INT_N thread. */
-    pdb_int_n_run(/*cfg*/);
+    pdb_int_n_run(cfg);
 }