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Add Huion-Kamvas-Pro-19 BPF fixup

Benjamin Tissoires requested to merge bentiss/udev-hid-bpf:wip/huion-kamvas-pro-19 into main

This tablets gets a lot of things wrong:

  • the secondary button is reported through Secondary Tip Switch
  • the third button is reported through Invert

Fortunately, before entering eraser mode, (so Invert = 1), the tablet always sends an out-of-proximity event. So we can detect that single event and:

  • if there was none but the invert bit was toggled: this is the third button
  • if there was this out-of-proximity event, we are entering eraser mode, and we will until the next out-of-proximity.

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