net/mlx5e: Add TX support for netmems

Declare netmem TX support in netdev.

As required, use the netmem aware dma unmapping APIs
for unmapping netmems in tx completion path.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250616141441.1243044-13-mbloch@nvidia.com


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