Add IpClientCallbacks.onNewDhcpResults(DhcpResultsParcelable)

Add new callback to replace old one. Target to remove
onNewDhcpResults(Dhcpresults). The previous onNewDhcpResults
callback will be removed after clients are migrated.

Bug: 135998869
Test: build
Test: atest FrameworksNetTests NetworkStackTests
Change-Id: Id6c72228560dc3c387755c27adacaa9aece6309a