drm/ttm: move the LRU into resource handling v4

This way we finally fix the problem that new resource are
not immediately evict-able after allocation.

That has caused numerous problems including OOM on GDS handling
and not being able to use TTM as general resource manager.

v2: stop assuming in ttm_resource_fini that res->bo is still valid.
v3: cleanup kerneldoc, add more lockdep annotation
v4: consistently use res->num_pages

Signed-off-by: Christian König <[email protected]>
Tested-by: Bas Nieuwenhuizen <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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