drm/ttm: add common accounting to the resource mgr v3

It makes sense to have this in the common manager for debugging and
accounting of how much resources are used.

v2: cleanup kerneldoc a bit
v3: drop the atomic, update counter under lock instead

Signed-off-by: Christian König <[email protected]>
Reviewed-by: Huang Rui <[email protected]> (v1)
Reviewed-by: Matthew Auld <[email protected]>
Tested-by: Bas Nieuwenhuizen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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