feat(tfut): add run support for unit testing

This patch adds the necessary changes in order for unit tests to
be run, given a run config.
Unit tests run on te host machine, so there is no FVP or any other
type of platform involved.

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Signed-off-by: Edward Potapov <edward.potapov@arm.com>
Change-Id: Ida431e2355aa19d34289804dfc2461411148be25
2 files changed