libbinder: delete tests for linkToDeath w/ no ref

These tests succeeded before because of a circular reference that held
onto a binder when it was linked to death. Now that this circular link
is broken, these tests fail.

Bug: 137587622
Bug: 137212433
Test: binderLibTest

Change-Id: Iaf150012d8883b642c9b3cd065d4a2299cbffb79