Add provider param to prepare_iosxr_tests role tasks (#25163)

This will avoid passing -u -k to ansible-playbook
(cherry picked from commit 69efb61008)

test/integration/targets/prepare_iosxr_tests/tasks/main.yml

@@ -3,6 +3,7 @@
 - name: Ensure we have loopback 888 for testing
   iosxr_config:
     src: config.j2
+    provider: "{{ cli }}"
 
 
 # Some AWS hostnames can be longer than those allowed by the system we are testing