drm/xe/uapi: add some kernel-doc for region query

Since we need to extend this, we should also take the time to add some
basic kernel-doc here for the existing bits. Note that this is all still
subject to change when upstreaming.

Also convert XE_MEM_REGION_CLASS_* into an enum, so we can more easily
create links to it from other parts of the uapi.

Suggested-by: Gwan-gyeong Mun <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Filip Hazubski <[email protected]>
Cc: Carl Zhang <[email protected]>
Cc: Effie Yu <[email protected]>
Reviewed-by: Gwan-gyeong Mun <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>

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