HID: bpf: add first in-tree HID-BPF fix for the XPPen Artist 24

This commit adds a fix for XPPen Artist 24 where the second button on
the pen is used as an eraser.

It's a "feature" from Microsoft, but it turns out that it's actually
painful for artists. So we ship here a HID-BPF program that turns this
second button into an actual button.

Note that the HID-BPF program is not directly loaded by the kernel itself
but by udev-hid-bpf[0]. But having the sources here allows us to also
integrate tests into tools/testing/selftests/hid to ensure the HID-BPF
program are actually tested.

[0] https://gitlab.freedesktop.org/libevdev/udev-hid-bpf

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Peter Hutterer <[email protected]>
Signed-off-by: Benjamin Tissoires <[email protected]>

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