drm/panfrost: Use xarray and helpers for depedency tracking

More consistency and prep work for the next patch.

Aside: I wonder whether we shouldn't just move this entire xarray
business into the scheduler so that not everyone has to reinvent the
same wheels. Cc'ing some scheduler people for this too.

v2: Correctly handle sched_lock since Lucas pointed out it's needed.

v3: Rebase, dma_resv_get_excl_unlocked got renamed

v4: Don't leak job references on failure (Steven).

Reviewed-by: Boris Brezillon <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: "Christian König" <[email protected]>
Cc: Luben Tuikov <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Steven Price <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Tomeu Vizoso <[email protected]>
Cc: Alyssa Rosenzweig <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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