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zink: restrict implicit feedback loop detection using miplevels/layers

Mike Blumenkrantz requested to merge zmike/mesa:zink-feedbackloopsuperhardmaximumfpsallthefpssomuchfps into main

What does this MR do and why?

zink: restrict implicit feedback loop detection using miplevels/layers

this improves perf by like 70-100% in games like Everspace, which draw
to a different miplevel of the same image that the fragment shader samples

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