Disable avc check, extend the duration a bit

Author: psss

tests/provision/bootc/main.fmf

@@ -4,9 +4,10 @@ tag+:
   - provision-bootc
 require:
   - tmt+provision-virtual
+duration: 40m
 
 # As for now there is an expected AVC failure:
 # https://github.com/osbuild/bootc-image-builder/issues/645
 check:
   - how: avc
-    result: xfail
+    enabled: false