ethernet: rename restart() to maybeRestart()

Since maybeRestart() does not perform a restart when IpClient is not
already running.
Also moves a log statement, so the restart log message only appears when
the IpClient is actually restarted.

Bug: 269387860
Test: TH
Change-Id: I318856374051c42762af8ce6ab81aade85a0755b
1 file changed