Add support for the Maxim MAX6654 to the lm90 driver.

The MAX6654 is a temperature sensor, similar to the others,
but with some differences regarding the configuration
register, and the sampling rate at which extended resolution
becomes possible.
Signed-off-by: Josh Lehan <krellan@google.com>
Link: https://lore.kernel.org/r/20200513184248.145765-1-krellan@google.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>