mem-garnet: Remove extraneous loop in Router resetStats.
mem-garnet: Remove extraneous loop in Router resetStats.

This outer loop makes no sense.

Change-Id: Ibe4b8b50c5843fba2119906f59ea1cb6c1d8c762
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29254
Reviewed-by: Srikant Bharadwaj <7abd8a1e0eed8fe42789a2587ba3e2bbeb88f55b@amd.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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