mem-ruby: Remove index based functions in bloom filters

mem-ruby: Remove index based functions in bloom filters

Most of the index based functions were not implemented, and a
user is more likely to be interested in checking the filter
contents based on an address than an index.

As a side effect, the Bulk's hash function became unused, and
according to the paper permute() was doing more than just
permuting, so it was renamed.

Change-Id: I6423a2565a082fee2e7f11fa489a11f253064d99
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18732
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>