[RESEND PATCH] drm/plane-helper: Add the missing declaration of drm_atomic_state

[Ma Jun]

Add the missing declaration of struct drm_atomic_state to fix the
compile error below:

error: 'struct drm_atomic_state' declared inside parameter
list will not be visible outside of this definition or declaration [-Werror]

Signed-off-by: Ma Jun <majun at amd.com>
---
 include/drm/drm_plane_helper.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
index b00ad36cf5b6..530f88176db4 100644
--- a/include/drm/drm_plane_helper.h
+++ b/include/drm/drm_plane_helper.h
@@ -30,6 +30,7 @@ struct drm_crtc;
 struct drm_framebuffer;
 struct drm_modeset_acquire_ctx;
 struct drm_plane;
+struct drm_atomic_state;
 
 int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *crtc,
 				    struct drm_framebuffer *fb,
-- 
2.25.1