hwmon updates for v5.2

- Add driver for Intersil ISL68137 PWM Controller
- Add driver for Lochnagar 2
- Add driver for Infineon IR38064 Voltage Regulator
- Add support for TMP75B to lm75 driver
- Convert documentation to ReST format
- Use request_muxed_region for Super-IO accesses in several drivers
- Add 'samples' attribute to ABI, and start using it
- Add support for custom sysfs attributes to pmbus drivers
  (used in ISL68137 driver)
- Introduce HWMON_CHANNEL_INFO macro
- Automated changes:
 - Use permission specific [SENSOR_][DEVICE_]ATTR variants
 - Fix build warnings due to unused of_device_id structures
 - Use HWMON_CHANNEL_INFO macro
- Various minor improvements and fixes
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