openbmc-20160321-1

ADM1278 is mostly compatible to other chips of the same series.
Besides the usual difference in coefficients, it supports
a temperature sensor, and it can measure both input and output
voltage at the same time.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
(cherry picked from commit 709066acdd12c3312c94ebccc37630932e381949)
Signed-off-by: Joel Stanley <joel@jms.id.au>