drm/xe/xe2: Enable Priority Mem Read

Enable feature to allow memory reads to take a priority memory path.
This will reduce latency on the read path, but may introduce read after
write (RAW) hazards as read and writes will no longer be ordered.

To avoid RAW hazards, SW can use the MI_MEM_FENCE command or any other
MI command that generates non posted memory writes.  This will ensure
data is coherent in memory prior to execution of commands which read
data from memory. RCS,BCS and CCS support this feature.

No pattern identified in KMD that could lead to a hazard.

v2: Modify commit message, enable priority mem read feature for media,
modify version range, modify bspec detail (Matt Roper)

v3: Rebase, fix cramped line-wrapping (jcavitt)

v4: Rebase

v5: Media does not support Priority Mem Read. Modify commit
to reflect the same.

v6: Rebase

Bspec: 60298, 60237, 60187, 60188

Signed-off-by: Pallavi Mishra <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Acked-by: José Roberto de Souza <[email protected]>
Acked-by: Carl Zhang <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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