drm/i915/selftests: Mock the status_page.vma for the kernel_context

Since we assert that the kernel_context is using the perma-pinned HWSP,
make it so.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2179
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200715155858.16410-1-chris@chris-wilson.co.uk
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/gt/mock_engine.c

@@ -332,6 +332,9 @@ int mock_engine_init(struct intel_engine_cs *engine)
 	if (IS_ERR(ce))
 		goto err_breadcrumbs;
 
+	/* We insist the kernel context is using the status_page */
+	engine->status_page.vma = ce->timeline->hwsp_ggtt;
+
 	engine->kernel_context = ce;
 	return 0;