resolv: Use the raw binder pointer address to identify dead binder

The NDK binder doesn't pass dead binder pointer to binder death handler.
The binder death handler can't know who was died as IBinder binderDied()
does. An alternative way is to use the raw address of binder interface
object to be an identification of dead binder.

Test: built, flashed, booted
      system/netd/tests/runtests.sh passes

Change-Id: I3c6f2840ddc51c85f417c1b0b4b0717e297f8a71