openpower-fru-vpd: fix mapper Wants for service

The previous Wants statement was on the old capitalized
inventory object.  Fix to use the lower-case inventory
object and remove 'manager' since there is no 'manager'
object.

Fixes openbmc/openbmc#1311.

Change-Id: I0caea10bc10a8f724d0951f592e396dd71e84743
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed