hwmon: (mc13783-adc) Remove the mention to 'Atlas'

'Atlas' was an internal name for the MC13783 PMIC only and does not
apply to MC13892.

To avoid confusion, remove the 'Atlas' term from the description.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>