base: Make the AddrRange::exclude method const.
base: Make the AddrRange::exclude method const.

This should not modify the base AddrRange, and can be marked const.

Change-Id: I8554707ab8dd895d24891acff18013308ab779a6
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50337
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Maintainer: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>

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