[fprint] Proposition for supporting new device

[Matthieu Vieira]

Hi,

I recently bought an Acer Swift 3. There's a LighTuning Fingerprint 
reader but it doesn't work on Fedora 25 (and more on all distributions I 
tested).
fprintd-enroll says that there is no device availables.

lsusb give the following result :
Bus 001 Device 003: ID 1c7a:0570 LighTuning Technology Inc.

My version of libfprint and fprintd is 0.7.

I don't have the knowledge to write a driver, however if I can help you 
by giving some USB log, and other files that could be helpful for you to 
support the driver, I will do it with pleasure. Just tell me what you need.

Regards,
Matthieu Vieira
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