hwmon: (f75375s) Add support for F75387SG/RG

Fintek F75387SG/RG is mostly compatible to F75373/F75375. Add support for it
to the F75375S driver.

Fan support for F75387SG/RG has been implemented but not tested.

Cc: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Bjoern Gerhart <oss@extracloud.de>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>