lowpan: Make various data classes Parcelable

This change updates several of the data classes in
`android.net.lowpan` to be parcelable. This allows them to be used
directly for inter-process communication.

Bug: b/63707448 b/63708348
Change-Id: Ib5e8cad153534948ff4b43a2fda82f3db250839e
Test: Confirmed with unit tests from change id
      I41d590b1e77dc41873c4b9e9bf1b7f1bf859f74e