twister: tests: Use inheritance in test_config.yaml

There is no need of repeating the same entries in a scope
that is supposed to extend another one.

Signed-off-by: Maciej Perkowski <Maciej.Perkowski@nordicsemi.no>

tests/test_config.yaml

@@ -13,7 +13,7 @@ levels:
   - name: acceptance
     description: >
       More coverage
+    inherits:
+      - smoke
     adds:
       - kernel.*
-      - arch.interrupt
-      - boards.*