drm/i915/gtt: Recursive ppgtt clear for gen8

With an explicit level, we can refactor the separate clear functions
as a simple recursive function. The additional knowledge of the level
allows us to spot when we can free an entire subtree at once.

Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Abdiel Janulgue <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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