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

Also quite simple, a single call needs 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/20210323155059.628690-47-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c

@@ -116,7 +116,7 @@ static int igt_gpu_reloc(void *arg)
 	if (IS_ERR(scratch))
 		return PTR_ERR(scratch);
 
-	map = i915_gem_object_pin_map(scratch, I915_MAP_WC);
+	map = i915_gem_object_pin_map_unlocked(scratch, I915_MAP_WC);
 	if (IS_ERR(map)) {
 		err = PTR_ERR(map);
 		goto err_scratch;