sysfs/cpu: Add vulnerability folder for ppc64el

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Canonical,

if you are planning to integrate the following patch, you will need the ppc64el patches that could be found attached to this bug:

From f0dadb2e6bd7b463670a6230d5c23ad859f11c75 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <email address hidden>
Date: Sun, 7 Jan 2018 22:48:00 +0100
Subject: [PATCH 1/3] sysfs/cpu: Add vulnerability folder

As the meltdown/spectre problem affects several CPU architectures, it makes
sense to have common way to express whether a system is affected by a
particular vulnerability or not. If affected the way to express the
mitigation should be common as well.

Create /sys/devices/system/cpu/vulnerabilities folder and files for
meltdown, spectre_v1 and spectre_v2.

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[Manoj Iyer (manjo)]

Marking bionic as fix-released since the patch identified here is in bionic-master
87590ce6e373 sysfs/cpu: Add vulnerability folder

[Manoj Iyer (manjo)]

Also tested on power9 w/4.15.0-13-generic #14-Ubuntu to confirm the presense of the directory cpu/vulnerabilities

ubuntu@dradis:~$ ls /sys/devices/system/cpu/vulnerabilities
meltdown spectre_v1 spectre_v2
ubuntu@dradis:~$