net: ieee802154: at86rf230: Forward Tx trac errors

Commit 493bc90a ("at86rf230: add debugfs support") brought trac
support as part of a debugfs feature, in order to add some testing
capabilities involving ack handling.

As we want to collect trac errors but do not need the debugfs feature
anymore, let's partially revert this commit, keeping the Tx trac
handling part which still makes sense. This allows to always return the
trac error directly to the core with the recently introduced
ieee802154_xmit_error() helper.

Suggested-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220407100903.1695973-8-miquel.raynal@bootlin.com


Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>