drm/i915/uapi: Add DRM_I915_QUERY_GEOMETRY_SUBSLICES

Newer platforms have DSS that aren't necessarily available for both
geometry and compute, two queries will need to exist. This introduces
the first, when passing a valid engine class and engine instance in the
flags returns a topology describing geometry.

Based on past discussion, we currently only support this new query item
on Xe_HP and beyond; earlier platforms do not need to worry about
geometry and compute pipelines having access to different topology and
should continue to use the existing topology query.

v2: fix white space errors
v3: change flags from hosting 2 8 bit numbers to holding a
i915_engine_class_instance struct
v4: add error if non rcs engine passed.
v5 (by MattR):
 - Improve kerneldoc and cross references to related structs/enums.
   (Daniel)
 - Clarify that geometry query is only supported on render engines
   (Francisco)
 - Clarify that the new query is only supported on Xe_HP+.
 - Fix checkpatch warnings.

Cc: Ashutosh Dixit <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Francisco Jerez <[email protected]>
UMD (mesa): https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14143
Testcase: igt@i915_query@test-query-geometry-subslices
Signed-off-by: Matt Atwood <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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