drm/sched: improve docs around drm_sched_entity

I found a few too many things that are tricky and not documented, so I
started typing.

I found a few more things that looked broken while typing, see the
varios FIXME in drm_sched_entity.

Also some of the usual logics:
- actually include sched_entity.c declarations, that was lost in the
  move here: 620e762f9a98 ("drm/scheduler: move entity handling into
  separate file")

- Ditch the kerneldoc for internal functions, keep the comments where
  they're describing more than what the function name already implies.

- Switch drm_sched_entity to inline docs.

Acked-by: Melissa Wen <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]> (v1)
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: "Christian König" <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Steven Price <[email protected]>
Cc: Emma Anholt <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Andrey Grodzovsky <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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