drm/vc4: tests: Convert to plane creation helper

Now that we have a plane create helper for kunit mocked drivers, let's
convert to it in vc4.
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240527-kms-hdmi-connector-state-v15-27-c5af16c3aae2@kernel.orgSigned-off-by: Maxime Ripard <mripard@kernel.org>

drivers/gpu/drm/vc4/tests/vc4_mock_plane.c

 // SPDX-License-Identifier: GPL-2.0
 
-#include <drm/drm_atomic_state_helper.h>
-#include <drm/drm_fourcc.h>
-#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_kunit_helpers.h>
 #include <drm/drm_plane.h>
 
 #include <kunit/test.h>
 
 #include "vc4_mock.h"
 
-static const struct drm_plane_helper_funcs vc4_dummy_plane_helper_funcs = {
-};
-
-static const struct drm_plane_funcs vc4_dummy_plane_funcs = {
-	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
-	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
-	.reset			= drm_atomic_helper_plane_reset,
-};
-
-static const uint32_t vc4_dummy_plane_formats[] = {
-	DRM_FORMAT_XRGB8888,
-};
-
 struct drm_plane *vc4_dummy_plane(struct kunit *test, struct drm_device *drm,
 				  enum drm_plane_type type)
 {
 	struct drm_plane *plane;
 
-	plane = __drmm_universal_plane_alloc(drm, sizeof(struct drm_plane), 0,
-						 0,
-						 &vc4_dummy_plane_funcs,
-						 vc4_dummy_plane_formats,
-						 ARRAY_SIZE(vc4_dummy_plane_formats),
-						 NULL,
-						 DRM_PLANE_TYPE_PRIMARY,
-						 NULL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, plane);
+	KUNIT_ASSERT_EQ(test, type, DRM_PLANE_TYPE_PRIMARY);
 
-	drm_plane_helper_add(plane, &vc4_dummy_plane_helper_funcs);
+	plane = drm_kunit_helper_create_primary_plane(test, drm,
+						      NULL,
+						      NULL,
+						      NULL, 0,
+						      NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, plane);
 
 	return plane;
 }