Migrate HostClipboardMonitor to virtio-vsock

The Android Studio Emulator is migrating from
/dev/goldfish_pipe to virto devices.

Bug: 182436079
Test: boot, check if clipboard exchanges with the host
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: I323cb533c2b1eaa315204c1cf46a4d83e4a96ec0