drm/i915/uapi: reject set_domain for discrete

The CPU domain should be static for discrete, and on DG1 we don't need
any flushing since everything is already coherent, so really all this
does is an object wait, for which we have an ioctl. Longer term the
desired caching should be an immutable creation time property for the
BO, which can be set with something like gem_create_ext.

One other user is iris + userptr, which uses the set_domain to probe all
the pages to check if the GUP succeeds, however we now have a PROBE
flag for this purpose.

v2: add some more kernel doc, also add the implicit rules with caching

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]>
Acked-by: Kenneth Graunke <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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