[lm-sensors] [PATCH v4] hwmon: Add support for MAX6642

[Per Dalén]

First a big thanks to Guenter Roeck for helping me (allot) to cleanup
this driver

v3 -> v4:
 * Removed "data->valid = 0;" (missed that in v3 ;)
 * only read the limits once
 * changed the temp_input and temp_high as suggested by Guenter, also
changed the functions/macros related to that change
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