selftests: drivers: hw: move to KTAP output

selftests: drivers: hw: move to KTAP output

Update the ethtool_rmon.sh test so that it uses the KTAP format for its
output. This is achieved by using the helpers found in ktap_helpers.sh.
An example output can be found below.

 $ ./ethtool_rmon.sh endpmac3 endpmac4
 TAP version 13
 1..14
 ok 1 ethtool_rmon.rx-pkts64to64
 ok 2 ethtool_rmon.rx-pkts65to127
 ok 3 ethtool_rmon.rx-pkts128to255
 ok 4 ethtool_rmon.rx-pkts256to511
 ok 5 ethtool_rmon.rx-pkts512to1023
 ok 6 ethtool_rmon.rx-pkts1024to1518
 ok 7 ethtool_rmon.rx-pkts1519to10240
 ok 8 ethtool_rmon.tx-pkts64to64
 ok 9 ethtool_rmon.tx-pkts65to127
 ok 10 ethtool_rmon.tx-pkts128to255
 ok 11 ethtool_rmon.tx-pkts256to511
 ok 12 ethtool_rmon.tx-pkts512to1023
 ok 13 ethtool_rmon.tx-pkts1024to1518
 ok 14 ethtool_rmon.tx-pkts1519to10240
 # Totals: pass:14 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/20260330152933.2195885-8-ioana.ciornei@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>