Input: edt-ft5x06 - get/set M12 report rate by sysfs

Input: edt-ft5x06 - get/set M12 report rate by sysfs

Add support for reading/writing scan rate (SC) register for M12 by
sysfs. The register value is equal to the SC (Hz), unlike M06, where
instead it is equal to SC / 10.

Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Tested-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/r/20220621123937.1330389-3-dario.binacchi@amarulasolutions.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>