selftest: include dst-ip in ethtool ntuple rules

sfc hardware does not support filters with only ipproto + dst-port;
 adding dst-ip to the flow spec allows the rss_ctx test to be run on
 these devices.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://patch.msgid.link/8e5d23c8f21310c23c080cc7bcd31b76f8fd3096.1731499022.git.ecree.xilinx@gmail.com


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