Input: edt-ft5x06 - remove code duplication

The use of the macros M06_REG_ADDR and M06_REG_CMD avoids code
duplication without impacting the application load, and reduces the
chances of errors or mistakes.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/r/20230402200951.1032513-6-dario.binacchi@amarulasolutions.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>