test: Allow self-contained tests to run in parallel

The IPA, IPC and Stream tests are self-contained so they can run in
parallel.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/stream/meson.build

@@ -7,5 +7,5 @@ foreach t : stream_tests
                    dependencies : libcamera_dep,
                    link_with : test_libraries,
                    include_directories : test_includes_internal)
-  test(t[0], exe, suite: 'stream', is_parallel: false)
+  test(t[0], exe, suite: 'stream')
 endforeach