ext, configs: Add example Arm gem5 SST platform

JIRA: https://gem5.atlassian.net/browse/GEM5-1121

Change-Id: I7544823710d9a63146d18d4fe9b7c969312ad4d7
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53627
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed