lint: fix spammy makefile invocation (#174)
lint: fix spammy makefile invocation (#174)

```
Makefile.core.mk:13: warning: overriding recipe for target
'lint-copyright-banner'
common/Makefile.common.mk:38: warning: ignoring old recipe for target
'lint-copyright-banner'
```

was happening before
istio/ztunnel,istio/ztunnel,istio/ztunnel,istio/ztunnel,istio/ztunnel