configs: Use integer division in MESI_Three_Level_HTM.py

num_cpus_per_cluster and num_l2caches_per_cluster need to be integer
as we are iterating over those variables

Cherry-picked from:
https://gem5-review.googlesource.com/c/public/gem5/+/42883

Change-Id: Ifc1f9cf06b36044289a0ba5e54666f1af2587fca
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43144
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed