Build: Add tf-m-tests specific config setting

Move tf-m-tests specific config setting to test/config/ from TF-M repo.
It decouples tf-m-tests specific config setting from TF-M.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: Iceecd0d97b4319c79acc576a3a66c06ae6bff795
5 files changed