Make cloud controller manager image multi arch in bazel

[jakweg]

PR #925 added support for multi architecture images of GCP CCM.

Google internal tools use bazel configuration in cmd/cloud-controller-manager/BUILD which is only able to build single platform images.

This PR updates BUILD file to be able to build multiplatform images as well while keeping compatibility with current pipelines.

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[upodroid]

Hey, I authored the PR you referenced, we don't use bazel to build the images so you can remove this section.

[upodroid]

On a sidenote, we are removing bazel from this repository: #916
@justinsb

[jakweg]

Hey, Thanks for reaching out.

I saw that we, internally at Google, still use this Bazel file - that's why I created the PR.

Since you want to get rid of Bazel in the first place, maybe I should point the internal infrastructure to use the flow you've updated recently? WDYT @justinsb?

[upodroid]

Please point your internal build process to the new approach for the docker images, we'll be doing the same to the binaries as well

[jakweg]

Thanks upodroid for collaboration, pipeline has been modified on our side. Closing this PR.