Makefile: make msix/msi depend on CONFIG_PCI

Possible now that pci is not depending on these.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Makefile.objs

@@ -168,7 +168,8 @@ hw-obj-$(CONFIG_VIRTIO) += virtio.o virtio-console.o
 hw-obj-y += fw_cfg.o
 # FIXME: Core PCI code and its direct dependencies are required by the
 # QMP query-pci command.
-hw-obj-y += pci.o pci_bridge.o msix.o msi.o
+hw-obj-y += pci.o pci_bridge.o
+hw-obj-$(CONFIG_PCI) += msix.o msi.o
 hw-obj-$(CONFIG_PCI) += pci_host.o pcie_host.o
 hw-obj-$(CONFIG_PCI) += ioh3420.o xio3130_upstream.o xio3130_downstream.o
 hw-obj-y += watchdog.o