Revert "Force ARNR filtering to be centered on the ARF frame"

This reverts commit 59e733ca.

Hold off removing arnr_type to give users the opportunity
to change their script files to handle its deprecation. A
follow-up patch will mark the control for setting arnr_type
as deprecated and it will be removed completely in a later
revision of the code.

Change-Id: I8b817c744e144d3714234a4cd4309816d0c7e3e8