mpc106: Allow multiple of the same PCI device.

Grackle allows attaching different PCI devices. This change allows attach multiple of the same PCI device. To make the name unique in the machine map, the name of the PCI slot is appended to the device name.

devices/memctrl/mpc106.cpp

@@ -66,7 +66,7 @@ int MPC106::device_postinit()
     for (auto& slot : pci_slots) {
         pci_dev_name = GET_STR_PROP(slot.first);
         if (!pci_dev_name.empty()) {
-            this->attach_pci_device(pci_dev_name, slot.second);
+            this->attach_pci_device(pci_dev_name, slot.second, std::string("@") + slot.first);
         }
     }