Support attach limits for new machine types

[msau42]

There are a ton of new machines types and most should have 127 as the attach limit

https://cloud.google.com/compute/docs/machine-types

/help

[k8s-ci-robot]

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In response to this:

There are a ton of new machines types and most should have 127 as the attach limit

https://cloud.google.com/compute/docs/machine-types

/help

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[davidz627]

/assign