drm/i915/selftests: Prepare gtt tests for obj->mm.lock removal

We need to lock the global gtt dma_resv, use i915_vm_lock_objects
to handle this correctly. Add ww handling for this where required.

Add the object lock around unpin/put pages, and use the unlocked
versions of pin_pages and pin_map where required.

Signed-off-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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