Including the machine sizes that were missing

[Nepomuceno]

Some of the machine sizes supported on Azure were not on the list of machine sizes.

[msftclas]

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[ahmetb]

@Nepomuceno Hi and thanks for your pull request. Unfortunately we won't be able to merge it, the code in arm/ package is auto-generated from API definitions. Fortunately, they are open and you can contribute. There's already an open issue for that at Azure/azure-rest-api-specs#10 , please submit a Pull Request for that repo and next time we re-generate the code, they'll be picked up.