config, arm: FS configuration for the ARM starter kit

config, arm: FS configuration for the ARM starter kit

Add a full system example configuration for the ARM Research Starter
Kit on System Modeling. More information can be found at:
http://www.arm.com/ResearchEnablement/SystemModeling

Change-Id: Ifa40419d21923a32bb383d58466e421fe4260ddd
Signed-off-by: Gabor Dozsa <gabor.dozsa@arm.com>
[ Minor cleanups and more documentation ]
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/4202
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>