Fix divergent equals and hashCode behavior.

Calling Objects.hash with a byte[] will call the identity hashCode on the
byte[] (rssiBuckets) and this doesn't agree with the use of Arrays.equals
in equals.
Bug caught by error prone.

Bug: 27723540
Change-Id: I1c82a5b9f5ba1bb4428c6954f6dc110790a5e728