drm/sched: Add dependency tracking

Instead of just a callback we can just glue in the gem helpers that
panfrost, v3d and lima currently use. There's really not that many
ways to skin this cat.

v2/3: Rebased.

v4: Repaint this shed. The functions are now called _add_dependency()
and _add_implicit_dependency()

Reviewed-by: Christian König <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]> (v3)
Reviewed-by: Steven Price <[email protected]> (v1)
Acked-by: Melissa Wen <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: "Christian König" <[email protected]>
Cc: Andrey Grodzovsky <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Nirmoy Das <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Luben Tuikov <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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