powerpc/eeh: Remove spurious use of pci_dn in eeh_dump_dev_log

Retrieve the domain, bus, device, and function numbers from the edev.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200725081231.39076-10-oohall@gmail.com