V4L/DVB (4365): OVERLAY flag were enabled by mistake

A patch from Aug, 17 activated by mistake OVERLAY flag on cx88-video,
together with several cx88-blackbird cleanups. This makes the cx88 driver
to report:
/dev/video0 [v4l2]: ioctl VIDIOC_G_FBUF: Invalid argument
instead of:
/dev/video0 [v4l2]: no overlay support
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-video.c

@@ -1180,7 +1180,6 @@ static int video_do_ioctl(struct inode *inode, struct file *file,
 			V4L2_CAP_READWRITE     |
 			V4L2_CAP_STREAMING     |
 			V4L2_CAP_VBI_CAPTURE   |
-			V4L2_CAP_VIDEO_OVERLAY |
 			0;
 		if (UNSET != core->tuner_type)
 			cap->capabilities |= V4L2_CAP_TUNER;