mem-ruby: Fix MultiGrainBloomFilter total count calculation
mem-ruby: Fix MultiGrainBloomFilter total count calculation

Previous value was always 0, and was never incrementing. The
total count should take into account the value stored in the
entry.

Change-Id: I93813e3f388198967b30cf11848a8a8c3a7b91f4
Signed-off-by: Daniel R. Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18733
Maintainer: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5