media: stm32: dma2d: remove unused fb_buf

Drop the unused struct v4l2_framebuffer fb_buf in struct dma2d_ctx.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
CC: Hugues Fruchet <hugues.fruchet@foss.st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/st/stm32/dma2d/dma2d.h

@@ -90,8 +90,6 @@ struct dma2d_ctx {
 	struct dma2d_frame	cap;
 	struct dma2d_frame	out;
 	struct dma2d_frame	bg;
-	/* fb_buf always point to bg address */
-	struct v4l2_framebuffer	fb_buf;
 	/*
 	 * MODE[17:16] of DMA2D_CR
 	 */