hw/usb: Add CanoKey Implementation

hw/usb: Add CanoKey Implementation

This commit added a new emulated device called CanoKey to QEMU.

CanoKey implements platform independent features in canokey-core
https://github.com/canokeys/canokey-core, and leaves the USB implementation
to the platform.

In this commit the USB part was implemented in QEMU using QEMU's USB APIs,
therefore the emulated CanoKey can communicate with the guest OS using USB.

Signed-off-by: Hongren (Zenithal) Zheng <i@zenithal.me>
Message-Id: <YoY6Mgph6f6Hc/zI@Sun>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>