lib: Update to the latest can2040 code

Rename to "match" state machine instead of "ack".
Minor simplification to tx_note_crc_start().
Call pio_match_clear() from report functions.
Add pio_match_calc_key() helper function.
Raise irq after 6 passive eof bits for faster rx message notification.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

lib/can2040/can2040.h

@@ -71,6 +71,7 @@ struct can2040 {
 
     // Transmits
     uint32_t tx_state;
+    uint32_t tx_eof_key;
     uint32_t tx_pull_pos, tx_push_pos;
     struct can2040_transmit tx_queue[4];
 };