Update tslint to expect Google LLC rather than Google Inc for file headers

[josephperrott]

See individual commits.

This change only causes conflicts in 1 PR, the other PRs are either unaffected or target a different branch.

$ yarn ng-dev pr discover-new-conflicts 20629
Retrieved 31 total pending PRs
Checking 6 PRs for conflicts after a merge of #20629
[========================================] ETA: 0s | 6/6

Result:
1 PR(s) which conflict(s) after #20629 merges:
    - #20556: fix(@angular/cli): Support XDG Base Directory Specfication

[alan-agius4]

@josephperrott, can you please create a separate PR for patch versions as it has conflicts? Thanks

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