feat: support for arm based trainer image using arm runner

[jaiakash]

What this PR does / why we need it:
This PR adds

• Support to build arm based trainer images using arm runner provided by CNCF. (oracle-16cpu-64gb-arm64)
• This also removes linux/ppc64le platform image for trainer-controller-manager (tentaive)

Which issue(s) this PR fixes
Fixes #2422

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

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[coveralls]

Pull Request Test Coverage Report for Build 20409798999

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 51.435%

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Totals
Change from base Build 20289967122:	0.0%
Covered Lines:	1237
Relevant Lines:	2405

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💛 - Coveralls

[jaiakash]

Please check this before, #2422 (comment)