Power supply monitor recipe, service, and conf

Add the Witherspoon power supply monitor application, service file, and
configuration files to the witherspoon-pfault-analysis recipe.

Moved OBMC_POWER_SUPPLY_INSTANCES to the global metadata so it can be
shared between recipes.

Resolves: openbmc/openbmc#1731

Depends-On: Ie364a3dc5b7f19cbc587450fc54f231d1ec280f7

Change-Id: I340a1d48a979a97624843e59a5ab1b1ad04056bb
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
6 files changed