hwmon: (pmbus/mp2975) Correct comment inside 'mp2975_read_byte_data'

The current driver code no longer perfrom internal conversion from
VID to direct. Instead it configures READ_VOUT using MFR_DC_LOOP_CTRL.
Correct the comment message inside the 'mp2975_read_byte_data'
function to match the driver logic.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Fixes: c60fe56c ("hwmon: (pmbus/mp2975) Fix driver initialization for MP2975 device")
Link: https://lore.kernel.org/r/20240127154844.989-1-aladyshev22@gmail.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>