DO NOT MERGE fix some linkproperties configs missing

In handleUpdateLinkProperties(), it will always assign newLp
to nai first. Then, the copied newLp would add some configurations
ex: private dns/clatd. This updated newLp wouldn't be assigned back to
nai when linkproperties is not changed.

Bug: 113637648
Test: - build, flash, booted
      - atest FrameworksNetTests
      - run CtsNetTestCases

Change-Id: I9e25e46718e076d4afa784ee5e1d3abbe0f11911