mem-ruby: Parameterize block size in Bloom Filters

mem-ruby: Parameterize block size in Bloom Filters

Substitute all occurrences of Ruby's block size by a
Python configurable offset.

Change-Id: If4913e842921447deda943b0482fb0c78a44c275
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18737
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>