net: add macsec offload selftest
JIRA: https://issues.redhat.com/browse/RHEL-24616
Backport of commits:
ecb3c1e675c7 selftests: rtnetlink: Make the set of tests to run configurable 02b34d03a24b netdevsim: add dummy macsec offload 3b5222e2ac57 selftests: rtnetlink: add MACsec offload tests
Patch 1 avoids a conflict when backporting the selftests.
Signed-off-by: Sabrina Dubroca sdubroca@redhat.com