mem-ruby: Generalize use of bloom filters' isSet

mem-ruby: Generalize use of bloom filters' isSet

In general the corresponding entries of an address are considered
to be set when the sum of all of them reach their maximum value
(i.e., they are all set), so generalize that into the base class.

Change-Id: If50b8c56065ad339b4ff2322ddc3c077a3bfc518
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18735
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>