net: ti: icssg-prueth: Add AF_XDP zero copy for TX

net: ti: icssg-prueth: Add AF_XDP zero copy for TX

Use xsk_pool inside tx_chn to check if a given Tx queue id
is registered for xsk zero copy, which gets populated during
xsk enable

If xsk_pool is set, get frames from the pool in NAPI
context and submit them to the Tx channel. Tx completion
is also handled in the NAPI context.

Use PRUETH_SWDATA_XSK to recycle xsk buffers back to the
umem pool. Add XDP_WAKEUP_TX support to enable xsk_wakeup
for Tx.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Link: https://patch.msgid.link/20251118135542.380574-4-m-malladi@ti.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>