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Add test configuration to machine config. Add testimage to Kas file, so
that testimage works out of the box.

Issue-Id: SCM-4304
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Change-Id: I27dc9760a2c58f43ea557efdc97d363b0d3c1447
Signed-off-by: Jon Mason <jon.mason@arm.com>