[PATCH V6] Add support for mouse logitech m560

Hi All,

This is the 6th attempt for a Logitech mouse M560 hid driver.


On the basis of the feedback received, I made some changes in the code:
v6:
- hid-core.c: rename extract() to hid_field_extract() and make it linkage
  external
- hid-logitech-hidpp.c: use hid_field_extract() instead of hidpp_extract()
  as per Jiri request.
- update the error message in m560_raw_event() to be more specific
v5:
- simplified the checks inside m560_raw_event()
- rearranged the return codes in m560_raw_event(): 0 in case the frame is not
  corrected, 1 if the data are correct. This is the behavior observed in
  other drivers, even if the returned values may vary.


The patch is against v4.1-rc5.

Special thanks to Antonio and Benjamin for their support and testing.

BR
G.Baroncelli

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