eliminate some anr_data_file permissions.

Init is now responsible for creating /data/anr, so it's
unnecessary to grant system_server and dumpstate permissions
to relabel this directory. Remove the excess permissions.

Leave system_data_file relabelfrom, since it's possible we're
still using it somewhere.

See commits:
  https://android-review.googlesource.com/161650
  https://android-review.googlesource.com/161477
  https://android-review.googlesource.com/161638

Bug: 22385254
Change-Id: I1fd226491f54d76ff51b03d4b91e7adc8d509df9