guestfs: fix PCIe passthrough device attachment

The virsh attach-device command was receiving the entire file
information dictionary instead of just the file path, causing:

  error: Failed to open file '{'path': '/path/to/file.xml', ...}'

Fixed by using {{ item.path }} instead of {{ item }} to extract
just the file path from the find results.

Generated-by: Claude AI
Reviewed-by: Chuck Lever <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>

Author: mcgrof

playbooks/roles/guestfs/tasks/bringup/main.yml

@@ -119,7 +119,7 @@
           - "virsh"
           - "attach-device"
           - "{{ inventory_hostname }}"
-          - "{{ item }}"
+          - "{{ item.path }}"
           - "--config"
       loop: "{{ passthrough_devices.files }}"
       loop_control: