provider/azurerm: Add cdn 'Origin type' argument

[razsha]

Hi,

Azure CDN Endpoint require choosing 'Origin type'.
Azure SDK GO : https://github.com/Azure/azure-sdk-for-go/blob/eb9eddfb7d680dca671221dba9e47626dd5fb464/arm/cdn/models.go
Azure Docs: https://docs.microsoft.com/en-us/azure/cdn/cdn-create-new-endpoint

Thanks,
Raz.

[ghost]

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