[PATCH v2 0/7] hwmon: Add support for MAX6695/6696 to lm90 driver

[Guenter Roeck <guenter.roeck@ericsson.com>]

This patchset cleans up the lm90 driver and adds support for
Maxim MAX6695/6696 temperature sensors.

In detail,
- Add support for tempX_emergency_alarm ABI attribute
- Introduce device feature bits to reduce runtime overhead
- Introduce function to delete sysfs files
- Simplify calculations in set_temp11()
- Introduce 3rd set of upper temperature limits (named 'emergency' limits)
- Add max6659 support for those limits, and add support for max6659 address 0x4e
- Add max6695/96 support

The patchset depends on the previously submitted lm90 driver cleanup patch.

v2 changes:
- Split patch into multiple parts
- Add support for max6659 address 0x4e and extra features
- Improved max6695/96 device detection code
- max6695/96 does not support extended external limits, so don't try to
  read them for the 3rd sensor
- Other changes to address review feedback
  - Updated Documentation/hwmon/lm90 and drivers/hwmon/Kconfig.
  - Fixed alert_alarms comment
  - remote offset register not supported on max6658 (fixed comment)
  - rewrote set_temp11()
  - Added tempX_emergency_alarm
  - Some code alignment fixes