[media] v4l: mem2mem_testdev: add support for dmabuf importing

This patch enhances mem2mem_testdev device with support for DMABUF importing
via V4L2_MEMORY_DMABUF memory type.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/mem2mem_testdev.c

@@ -839,7 +839,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *ds
 	int ret;
 
 	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
-	src_vq->io_modes = VB2_MMAP;
+	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
 	src_vq->drv_priv = ctx;
 	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 	src_vq->ops = &m2mtest_qops;
@@ -850,7 +850,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *ds
 		return ret;
 
 	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	dst_vq->io_modes = VB2_MMAP;
+	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
 	dst_vq->drv_priv = ctx;
 	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 	dst_vq->ops = &m2mtest_qops;