remove readonly property flag

[abaranwal-ms]

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[github-actions]

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[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Swagger	Microsoft.AzureStackHCI-StackHCI
Python	azure-mgmt-placeholder
Go	sdk/resourcemanager/azurestackhci/armazurestackhci
JavaScript	@azure/arm-azurestackhci
Java	com.azure.resourcemanager:azure-resourcemanager-azurestackhci