base: Fix isSubset() for addr ranges with interleaving

base: Fix isSubset() for addr ranges with interleaving

This change extends isSubset() which checks whether the range is a
subset of an input range to support address ranges with interleaving
and hashing.

Change-Id: I3dc9ceccb189b7c8665de0355f0555fc2c37d872
Reviewed-on: https://gem5-review.googlesource.com/12319
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>