drm/i915/uapi: reject caching ioctls for discrete

It's a noop on DG1, and in the future when need to support other devices
which let us control the coherency, then it should be an immutable
creation time property for the BO. This will likely be controlled
through a new gem_create_ext extension.

v2: add some kernel doc for the discrete changes, and document the
    implicit rules

Suggested-by: Daniel Vetter <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Ramalingam C <[email protected]>
Reviewed-by: Ramalingam C <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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