We define a new parent (ClusterSystem) to model a system with one or more cpu clusters within it. The idea is to make this new base class reusable by SE systems/scripts as well (like starter_se.py) Change-Id: I1398d773813db565f6ad5ce62cb4c022cb12a55a Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Richard Cooper <richard.cooper@arm.com>