drm/ttm: remove ttm_bo_wait_unreserved

With nouveau fixed all ttm-using drives have the correct nesting of
mmap_sem vs dma_resv, and we can just lock the buffer.

Assuming I didn't screw up anything with my audit of course.

v2:
- Dont forget wu_mutex (Christian König)
- Keep the mmap_sem-less wait optimization (Thomas)
- Use _lock_interruptible to be good citizens (Thomas)

v3: Rebase over fault handler helperification.

Reviewed-by: Christian König <[email protected]> (v2)
Reviewed-by: Thomas Hellström <[email protected]> (v2)
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Christian Koenig <[email protected]>
Cc: Huang Rui <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: "VMware Graphics" <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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