firewire: ohci: remove obsolete debug logging for AT/AR results

firewire: ohci: remove obsolete debug logging for AT/AR results

Between v6.11 and v6.12, a set of tracepoints was added to record
asynchronous communication events:

- firewire:async_phy_inbound
- firewire:async_phy_outbound_initiate
- firewire:async_phy_outbound_complete
- firewire:async_response_inbound
- firewire:async_response_outbound_initiate
- firewire:async_response_outbound_complete
- firewire:async_request_inbound
- firewire:async_request_outbound_initiate
- firewire:async_request_outbound_complete

These tracepoints cover the functionality of the existing debug logging.
This commit removes the logging.

Link: https://lore.kernel.org/r/20250821003017.186752-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>