Mention physical gamepad names for UHID devices

Initialize UHID devices with a custom name:
 - "scrcpy: $GAMEPAD_NAME" for gamepads
 - "scrcpy" for keyboard and mouse (or if no gamepad name is available)

The name may appear in Android apps.

PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>