net: bcmgenet: support reclaiming unsent Tx packets

When disabling the transmitter any outstanding packets can now
be reclaimed by bcmgenet_tx_reclaim_all() rather than by the
bcmgenet_fini_dma() function.

Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20250306192643.2383632-12-opendmb@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>