virtio-input: emulated devices [pci]

virtio-input: emulated devices [pci]

This patch adds virtio-pci support for the emulated virtio-input
devices.  Using them is as simple as adding "-device virtio-tablet-pci"
to your command line.  If you want add multiple devices but don't want
waste a pci slot for each you can compose a multifunction device this way:

qemu -device virtio-keyboard-pci,addr=0d.0,multifunction=on \
     -device virtio-tablet-pci,addr=0d.1,multifunction=on

Signed-off-by: Gerd Hoffmann <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>