virtio-pci: compile per-target

With vhost, virtio-pci needs to include kvm.h and kvm.h needs to be built
per-target.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Makefile.objs

@@ -130,7 +130,6 @@ user-obj-y += cutils.o cache-utils.o
 hw-obj-y =
 hw-obj-y += loader.o
 hw-obj-y += virtio.o virtio-console.o
-hw-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
 hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
 hw-obj-y += watchdog.o
 hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o

Makefile.target

@@ -164,7 +164,7 @@ ifdef CONFIG_SOFTMMU
 obj-y = arch_init.o cpus.o monitor.o machine.o gdbstub.o vl.o
 # virtio has to be here due to weird dependency between PCI and virtio-net.
 # need to fix this properly
-obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-serial-bus.o
+obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-pci.o virtio-serial-bus.o
 obj-y += rwhandler.o
 obj-$(CONFIG_KVM) += kvm.o kvm-all.o
 LIBS+=-lz