drm/vkms: Remove <drm/drm_simple_kms_helper.h> include

The driver doesn't use simple-KMS helpers to set a simple display pipeline
but only the drm_simple_encoder_init() function to initialize an encoder.

That helper is just a wrapper of drm_encoder_init(), but passing a struct
drm_encoder_funcs that sets the .destroy handler to drm_encoder_cleanup().

Since the <drm/drm_simple_kms_helper.h> header is only included for this
helper and because the connector is initialized with drm_connector_init()
as well, do the same for the encoder and drop the header include.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230406110235.3092055-3-javierm@redhat.com

drivers/gpu/drm/vkms/vkms_output.c

@@ -4,7 +4,6 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_probe_helper.h>
-#include <drm/drm_simple_kms_helper.h>
 
 static const struct drm_connector_funcs vkms_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
@@ -14,6 +13,10 @@ static const struct drm_connector_funcs vkms_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
+static const struct drm_encoder_funcs vkms_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
 static int vkms_conn_get_modes(struct drm_connector *connector)
 {
 	int count;
@@ -86,7 +89,8 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
 
 	drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
 
-	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
+	ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
+			       DRM_MODE_ENCODER_VIRTUAL, NULL);
 	if (ret) {
 		DRM_ERROR("Failed to init encoder\n");
 		goto err_encoder;