Remove unnecessary file

Resolves: RHEL-66175

testaarch64.fmf

@@ -1,21 +0,0 @@
-/plan:
-    summary: Basic test suite
-    discover:
-        how: fmf
-    execute:
-        how: tmt
-    adjust:
-        - when: arch != aarch64
-          enabled: false
-          because: components exist only on aarch64
-/test:
-    summary: Run all tests
-    test: |
-        git clone https://github.com/sssd-test/libeconf.git libeconf64
-        cd libeconf64/bindings/python3
-        cp econf.py test/econf.py
-        pytest -v test/test_econf_setters.py
-    require:
-      - git-core
-      - pytest
-    duration: 30m