can: flexcan: use can_rx_offload_queue_sorted() for flexcan_irq_bus_*()

Currently, in case of bus error, driver will generate error message and put
in the tail of the message queue. To avoid confusions, this change should
place the bus related messages in proper order.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>