tests: overlay: Add test suffix to the compiled blobs

The compiled blobs in the overlay tests do not have the test suffix which
is usually used to clean up and ignore the test artifacts.

Let's add that suffix.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed