PCI: Fix pci_dev_str_match_path() alloc while atomic bug

pci_dev_str_match_path() is often called with a spinlock held so the
allocation has to be atomic.  The call tree is:

  pci_specified_resource_alignment() <-- takes spin_lock();
    pci_dev_str_match()
      pci_dev_str_match_path()

Fixes: 45db3370 ("PCI: Allow specifying devices using a base bus and path of devfns")
Link: https://lore.kernel.org/r/20210812070004.GC31863@kili


Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>