This avoids clashing with real-world devices that have the same VID/PID.
Many thanks to Ricky WU <ricky_wu@realtek.com> for all the help.
Fixes: https://github.com/fwupd/fwupd/issues/3835
The best way of not getting something wrong is to not require it in the first
place...
All plugins now use DeviceInstanceId-style quirk matches and we can just drop
the prefix in all files. We were treating HwId=, Guid= and DeviceInstanceId= in
exactly the same way -- they're just converted to GUIDs when building the silo!
