stm32: canio: remove some unneeded declarations

Author: jepler

ports/stm/common-hal/canio/Listener.h

@@ -37,11 +37,3 @@ typedef struct canio_listener_obj {
     uint32_t timeout_ms;
     uint8_t fifo_idx;
 } canio_listener_obj_t;
-
-void common_hal_canio_listener_construct(canio_listener_obj_t *self, canio_can_obj_t *can, size_t nmatch, canio_match_obj_t **matches, float timeout);
-void common_hal_canio_listener_check_for_deinit(canio_listener_obj_t *self);
-void common_hal_canio_listener_deinit(canio_listener_obj_t *self);
-bool common_hal_canio_listener_receiveinto(canio_listener_obj_t *self, canio_message_obj_t *message);
-int common_hal_canio_listener_in_waiting(canio_listener_obj_t *self);
-float common_hal_canio_listener_get_timeout(canio_listener_obj_t *self);
-void common_hal_canio_listener_set_timeout(canio_listener_obj_t *self, float timeout);