Fix some checkstyle nits in DhcpPacketTest.

Use the Generated code suppression comment filter instead of the
IndentationCheck suppression comment filter because the latter
complains that '+' should be on a new line.

Bug: 120584519
Bug: 127423755
Test: atest NetworkStackTests
Test: atest FrameworksNetTests
Change-Id: Ia9865c75f940e2fbb3aef374a297339e8ea2fd1b
1 file changed