swift: Add max31785 device to hwmon for bring-up

To support fan control for swift system bring-up, the max31785 device
needs to be configured for hwmon to expose on dbus.

Tested:
    All max31785 configs and service files exist in the image

Change-Id: I002cec77bf18ca72f90d01d926c2d2a8d4b438a8
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
3 files changed