drm/ttm: Use the LRU walker helper for swapping

Rework the TTM swapping to use the LRU walker helper.
This helps fixing up the ttm_bo_swapout() interface
to be consistent about not requiring any locking.

For now mimic the current behaviour of using trylock
only. We could be using ticket-locks here but defer
that until it's deemed necessary. The TTM swapout
functionality is a bit weird anyway since it
alternates between memory types without exhausting
TTM_PL_SYSTEM first.

Intentionally keep pages as the unit of progress since
changing that to bytes is an unrelated change that can
be done later.

v6:
- Improve on error code translation in the swapout callback
  (Matthew Brost).
v7:
- Use s64 rather than long.
- Remove ttm_resource_cursor_fini() since it's no longer used.
- Rename ttm_resource_cursor_fini_locked() to
  ttm_resource_cursor_fini().
- Don't swap out pinned bos.

Cc: Christian König <[email protected]>
Cc: Somalapuram Amaranath <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: <[email protected]>
Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Matthew Brost <[email protected]> #v6
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Christian König <[email protected]>

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