feat: clone tf-m-tests and tf-m-extras

The platform self-test implemented by tfm resides in
the repos added here. They are needed for the upcoming
job to run tf-m's self-test at EL3 inside bl31.

Change-Id: I855ab552fdfff9d700739d96372b2357f2156f4d
Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
4 files changed