[DM] Remove enum from initializeParams diskType (#614)
[DM] Remove enum from initializeParams diskType (#614)

The `enum` values were incorrect for initializeParams.

See docs here: https://cloud.google.com/compute/docs/reference/rest/v1/instances#Instance.FIELDS.inlinedField_29
GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit