wspoon: Inhibit phosphor-hwmon-config-mrw

Use a hardcoded hwmon config file for the Witherspoon
max31785 chip.

Hopefully somewhat temporary workaround of missing tags in the
Witherspoon MRW.

Change-Id: Ibf03b6c566d600b34b52a0288e1c511b9ff07e4e
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
3 files changed