MM shouldn't generate redundant name for expand and flatten function

[neil-yechenwei]

Current Name : expandArmPrivateLinkServicePrivateLinkServicePropertiesAutoApproval Expect Name : expandArmPrivateLinkServicePropertiesAutoApproval Current Name : flattenArmPrivateLinkServicePrivateLinkServicePropertiesAutoApproval Expect Name : flattenArmPrivateLinkServicePropertiesAutoApproval