MIPS/EDAC: Improve OCTEON EDAC support.

Some initialization errors are reported with the existing OCTEON EDAC
support patch.  Also some parts have more than one memory controller.

Fix the errors and add multiple controllers if present.

Signed-off-by: David Daney <david.daney@cavium.com>

arch/mips/pci/pci-octeon.c

@@ -705,7 +705,8 @@ static int __init octeon_pci_setup(void)
 	 */
 	cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);
 
-	if (IS_ERR(platform_device_register_simple("co_pci_edac", 0, NULL, 0)))
+	if (IS_ERR(platform_device_register_simple("octeon_pci_edac",
+						   -1, NULL, 0)))
 		pr_err("Registation of co_pci_edac failed!\n");
 
 	octeon_pci_dma_init();