HID:Add support for UGTABLET WP5540

This patch adds support for the UGTABLET WP5540 digitizer tablet
devices. Without it, the pen moves the cursor, but neither the
buttons nor the tap sensor in the tip do work.

Signed-off-by: Sergio Costas <rastersoft@gmail.com>
Link: https://lore.kernel.org/r/63dece1d-91ca-1b1b-d90d-335be66896be@gmail.com


Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>