selftests: net: enable some more knobs

The rtnetlink tests require additional options currently
off by default.

Fixes: 2766a111 ("selftests: rtnetlink: add ipsec offload API test")
Fixes: 5e596ee1

 ("selftests: add xfrm state-policy-monitor to rtnetlink.sh")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/9048ca58e49b962f35dba1dfb2beaf3dab3e0411.1706723341.git.pabeni@redhat.com/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>