Install opal-prd package on OpenPOWER machines.

Frédéric Bonnardrequested to merge
frediz/hw-detect:patch-1 into master

Based on Dimitri's fix for LP: #1555904. As a reminder, opal-prd is the Processor RunTime Diagnostics daemon, the userspace process that on OpenPower systems is responsible for some of the runtime diagnostics.

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