phosphor-power: Only build monitor when told to

The 'monitor' package provides a power supply monitor application that
uses an org.open_power phosphor-dbus-interface that is only used
on a subset of the OpenPower systems.

So that non OpenPower systems can use phosphor-power and not need to
include the org.open_power D-Bus interfaces, add a packageconfig option
for this application to turn off its compilation.  It will then only be
enabled for certain machines.

Fixes openbmc/phosphor-power#6

Tested:
Built Witherspoon, application still built and installed.
Built Rainier, application not built.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ib7fca16217d93b7d021ba8fb6659e9ddca17d1d9

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