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

Convert a single pin_pages call to use the unlocked version.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-49-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c

@@ -47,7 +47,7 @@ static int igt_gem_huge(void *arg)
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
 
-	err = i915_gem_object_pin_pages(obj);
+	err = i915_gem_object_pin_pages_unlocked(obj);
 	if (err) {
 		pr_err("Failed to allocate %u pages (%lu total), err=%d\n",
 		       nreal, obj->base.size / PAGE_SIZE, err);