[uAPI] Remove MMIO ioctl
As the consensus appears to be from https://lore.kernel.org/all/20230706042044.GR6953@mdroper-desk1.amr.corp.intel.com/
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As the consensus appears to be from https://lore.kernel.org/all/20230706042044.GR6953@mdroper-desk1.amr.corp.intel.com/