[hermon] Add support for MT26418 device

PCI ID supplied (and tested) by Frederic
Temporelli <frederic.temporelli@bull.net>

src/drivers/infiniband/hermon.c

 static struct pci_device_id hermon_nics[] = {
 	PCI_ROM ( 0x15b3, 0x6340, "mt25408", "MT25408 HCA driver" ),
 	PCI_ROM ( 0x15b3, 0x634a, "mt25418", "MT25418 HCA driver" ),
+	PCI_ROM ( 0x15b3, 0x6732, "mt26418", "MT26418 HCA driver" ),
 };
 
 struct pci_driver hermon_driver __pci_driver = {