selftests: drv-net: rss_api: test input-xfrm and hash fields

selftests: drv-net: rss_api: test input-xfrm and hash fields

Test configuring input-xfrm and hash fields with all the limitations.
Tested on mlx5 (CX6):

  # ./ksft-net-drv/drivers/net/hw/rss_api.py
  TAP version 13
  1..10
  ok 1 rss_api.test_rxfh_nl_set_fail
  ok 2 rss_api.test_rxfh_nl_set_indir
  ok 3 rss_api.test_rxfh_nl_set_indir_ctx
  ok 4 rss_api.test_rxfh_indir_ntf
  ok 5 rss_api.test_rxfh_indir_ctx_ntf
  ok 6 rss_api.test_rxfh_nl_set_key
  ok 7 rss_api.test_rxfh_fields
  ok 8 rss_api.test_rxfh_fields_set
  ok 9 rss_api.test_rxfh_fields_set_xfrm
  ok 10 rss_api.test_rxfh_fields_ntf
  # Totals: pass:10 fail:0 xfail:0 xpass:0 skip:0 error:0

Link: https://patch.msgid.link/20250716000331.1378807-12-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>