drm/xe: Use DRM GPUVM helpers for external- and evicted objects

Adapt to the DRM_GPUVM helpers moving removing a lot of complicated
driver-specific code.

For now this uses fine-grained locking for the evict list and external
object list, which may incur a slight performance penalty in some
situations.

v2:
- Don't lock all bos and validate on LR exec submissions (Matthew Brost)
- Add some kerneldoc

Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Acked-by: Matthew Brost <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

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