[Bug 1765460] [NEW] [opal-prd] opal-prd is consuming 100% CPU

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---Problem Description---
opal-prd fix for Ubuntu 18.04

 In some corner cases where opal-prd fails to access/read flash device (/dev/mtd0) we see opal-prd consuming 100% cpu. This mostly happens during boot time where opal-prd daemon tries to start even before mtd driver loaded.   Its not easy to reproduce. It happens randomly.
 
---uname output---
Ubuntu 18.04
 
Machine Type = OpenPower System 
 
Userspace tool common name: opal-prd 
 
Below upstream patch will fix this issue.

commit cb16e55a234b91fd42112904cff15094fbae680d
Author: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
Date:   Tue Apr 3 23:08:41 2018 +0530

    opal-prd: Insert powernv_flash module
    
    Explictly load powernv_flash module on BMC based system so that we are sure
    that flash device is created before starting opal-prd daemon.
    
-Vasant

** Affects: skiboot (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-166963 severity-critical targetmilestone-inin1804
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[opal-prd]  opal-prd is consuming 100% CPU
https://bugs.launchpad.net/bugs/1765460
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