powerpc/PCI: Add struct pci_ops member names to initialization

Some instances of pci_ops initialization rely on the read/write members'
location in the struct. This is fragile and may break when adding new
members to the beginning of the struct.

No functional change.

Signed-off-by: Rob Herring <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
CC: Arnd Bergmann <[e-mail]>
CC: Benjamin Herrenschmidt <[e-mail]>
CC: Paul Mackerras <[e-mail]>
CC: Michael Ellerman <[e-mail]>
CC: [e-mail]
CC: [e-mail]

arch/powerpc/platforms/cell/celleb_scc_pciex.c

···
 }
 
 static struct pci_ops scc_pciex_pci_ops = {
-	scc_pciex_read_config,
-	scc_pciex_write_config,
+	.read = scc_pciex_read_config,
+	.write = scc_pciex_write_config,
 };
 
 static void pciex_clear_intr_all(unsigned int __iomem *base)