Add 8BitDo Pro 2 Motion Sensors

The 8BitDo Pro 2 should have a working gyroscope and/or accelerometer when connected in Nintendo Switch Pro Controller mode. The motion sensors might be exposed by the Kernel as a separate device like for some other controllers. A udev rule adding the "uaccess" tag to this device may be enough to make the motion sensors work in Dolphin and possibly Steam.

Steps to contribute

• Disconnect the controller;
• Run the command udevadm monitor --property;
• Connect the controller via either Bluetooth or USB. A bunch of text will be printed to the terminal by udevadm;
• Copy all text from the terminal, save to a file and attach to a comment on this issue.