Sync VAD example with TF-M

- The FWU API has been changed, so the example had to be aligned.
- Added project_config.h because of the changed configuration system.

Change-Id: Id3eaad458e9b0b98424a0373a65b4b0a8bc86206
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
6 files changed