tiny-containers: Run LXC tests on public armhf as well

Fix the N/A entries in the LXC reports.

test-cases/tiny-container-system-aa-enforcement.yaml

@@ -2,7 +2,7 @@ metadata:
   name: tiny-container-system-aa-enforcement
   format: "Apertis Test Definition 1.0"
   image-types:
-    tiny-lxc: [ armhf-internal, arm64, amd64 ]
+    tiny-lxc: [ armhf-internal, armhf, arm64, amd64 ]
   image-deployment:
     - LXC
   type: functional