feat(tfut): add test group for unit tests

This change adds the test groups for the tf-a unit tests.

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Signed-off-by: Edward Potapov <edward.potapov@arm.com>
Change-Id: I2fce248d09a1dd69326ae7f293b5d9a0283a7704
14 files changed