use a full vm for arm builds in travis (#714)

Co-authored-by: Jason Montleon <jmontleo@redhat.com>

Author: openshift-cherrypick-robot

.travis.yml

@@ -40,7 +40,7 @@ jobs:
     arch: ppc64le
   - arch: s390x
   - arch: arm64-graviton2
-    virt: lxd
+    virt: vm
     group: edge
   - arch: amd64
   - stage: push manifest