hwmon: peci: Add cputemp driver

Add peci-cputemp driver for Digital Thermal Sensor (DTS) thermal
readings of the processor package and processor cores that are
accessible via the PECI interface.

The main use case for the driver (and PECI interface) is out-of-band
management, where we're able to obtain the DTS readings from an external
entity connected with PECI, e.g. BMC on server platforms.

Co-developed-by: Jae Hyun Yoo <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Acked-by: Joel Stanley <[email protected]>
Signed-off-by: Jae Hyun Yoo <[email protected]>
Signed-off-by: Iwona Winiarska <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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