Merge branch 'selftests-drv-net-improve-zerocopy-tests'

Jakub Kicinski says:

====================
selftests: drv-net: improve zerocopy tests

A few tweaks to the devmem test to make it more "NIPA-compatible".
We still need a fix to make sure that the test sets hds threshold
to 0. Taehee is presumably already/still working on that:
https://lore.kernel.org/20250702104249.1665034-1-ap420073@gmail.com
so I'm not including my version.

  # ./tools/testing/selftests/drivers/net/hw/devmem.py
  TAP version 13
  1..3
  ok 1 devmem.check_rx
  ok 2 devmem.check_tx
  ok 3 devmem.check_tx_chunks
  # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
====================

Link: https://patch.msgid.link/20250811231334.561137-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>