mem-ruby: Remove Bloom Filter's print()

mem-ruby: Remove Bloom Filter's print()

Print was unused. As a side effect 'using namespace std' is no
longer needed.

Change-Id: Ief10cba1a11dfdd4edb7464eb9291fc83d6668cd
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18731
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>