feat(build): Automating localpv provisioner build for ppc64le

[Pensu]

Why is this PR required? What issue does it fix?:

This PR adds automation for building ppc64le image for localpv provisioner. This is a follow up to: #1632

What this PR does?:
Adds ppc64le build in travis file for localpv provisioner.

Does this PR require any upgrade changes?:

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Fixes #
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

[Pensu]

cc @akhilerm @mkumatag

[akhilerm]

changes looks good.
Can you also add a changelog as mentioned here to changelogs/unreleased