drm/shmobile: Use simple encoder

The shmobile driver uses empty implementations for its encoders. Replace
the code with the generic simple encoder.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Acked-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/shmobile/shmob_drm_crtc.c

···
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
 #include <drm/drm_vblank.h>
 
 #include "shmob_drm_backlight.h"
···
 	.mode_set = shmob_drm_encoder_mode_set,
 };
 
-static void shmob_drm_encoder_destroy(struct drm_encoder *encoder)
-{
-	drm_encoder_cleanup(encoder);
-}
-
-static const struct drm_encoder_funcs encoder_funcs = {
-	.destroy = shmob_drm_encoder_destroy,
-};
-
 int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
 {
 	struct drm_encoder *encoder = &sdev->encoder.encoder;
···
 
 	encoder->possible_crtcs = 1;
 
-	ret = drm_encoder_init(sdev->ddev, encoder, &encoder_funcs,
-			       DRM_MODE_ENCODER_LVDS, NULL);
+	ret = drm_simple_encoder_init(sdev->ddev, encoder,
+				      DRM_MODE_ENCODER_LVDS);
 	if (ret < 0)
 		return ret;