[media] omap_vout: add missing OVERLAY_OUTPUT cap and set V4L2_FBUF_FLAG_OVERLAY

The omap_vout driver has an output overlay, but never advertised that
capability.

The driver should also set the V4L2_FBUF_FLAG_OVERLAY flag.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
CC: Archit Taneja <archit@ti.com>
CC: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/omap/omap_vout.c

@@ -1046,7 +1046,8 @@ static int vidioc_querycap(struct file *file, void *fh,
 	strlcpy(cap->driver, VOUT_NAME, sizeof(cap->driver));
 	strlcpy(cap->card, vout->vfd->name, sizeof(cap->card));
 	cap->bus_info[0] = '\0';
-	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_OUTPUT;
+	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_OUTPUT |
+		V4L2_CAP_VIDEO_OUTPUT_OVERLAY;
 
 	return 0;
 }
@@ -1828,7 +1829,9 @@ static int vidioc_g_fbuf(struct file *file, void *fh,
 	ovid = &vout->vid_info;
 	ovl = ovid->overlays[0];
 
-	a->flags = 0x0;
+	/* The video overlay must stay within the framebuffer and can't be
+	   positioned independently. */
+	a->flags = V4L2_FBUF_FLAG_OVERLAY;
 	a->capability = V4L2_FBUF_CAP_LOCAL_ALPHA | V4L2_FBUF_CAP_CHROMAKEY
 		| V4L2_FBUF_CAP_SRC_CHROMAKEY;