drtm: use prebuilt DRTM ACS app

Use the app provided by the ACS team for robust testing.
This is the initial version and will be replaced with the
released version soon.

Change-Id: I874c972c0138e54bdc70289e1ba128e6aff4f016
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
3 files changed