hw/misc: add MAX34451 device

hw/misc: add MAX34451 device

The MAX34451 is a Maxim power-supply system manager that can monitor up to 16 voltage rails or currents. It also contains a temperature sensor and supports up to four external temperature sensors.

This commit adds support for interfacing with it, and setting limits on the supported sensors.

Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Signed-off-by: Titus Rwantare <titusr@google.com>
Message-Id: <20210708172556.1868139-5-titusr@google.com>
[Moved the device to the sensor directory]
Signed-off-by: Corey Minyard <cminyard@mvista.com>