hwmon: (mr75203) add VM pre-scaler x2 support

Add support for mr76006 pre-scaler which provides divide-by-2 scaling
of the input voltage, so that it can be  presented to the VM for
measurement within its range (the VM input range is limited from -0.1V
to 1V).

The driver reads from the device-tree all the channels that use the
mr76006 pre-scaler and multiplies the voltage result by a factor of 2,
to represent to the user with the actual voltage input source.

Channels that are not in the device-tree are multiplied by a factor
of 1.

Signed-off-by: Eliav Farber <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[groeck: Addressed conflicts against commit d59eacaac953]
Signed-off-by: Guenter Roeck <[email protected]>

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