Add missing whitespace to add_drivers argument

The following warning was displayed during kernel update on a Rocky
Linux 9 hypervisor configured with PCI passthrough:

    dracut: WARNING: <key>+=" <values> ": <values> should have surrounding white spaces!
    dracut: WARNING: This will lead to unwanted side effects! Please fix the configuration file.

Author: priteau

etc/kayobe/ansible/maintenance/pci-passthrough.yml

@@ -26,7 +26,7 @@
       ansible.builtin.blockinfile:
         path: /etc/dracut.conf.d/gpu-vfio.conf
         block: |
-          add_drivers+="vfio vfio_iommu_type1 vfio_pci"
+          add_drivers+=" vfio vfio_iommu_type1 vfio_pci "
         owner: root
         group: root
         mode: 0660