[media] v4l2: add VIDIOC_(TRY_)DECODER_CMD

As discussed during the 2011 V4L-DVB workshop, the API in dvb/video.h should
be replaced by a proper V4L2 API. This patch turns the VIDEO_(TRY_)DECODER_CMD
ioctls into proper V4L2 ioctls.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/v4l2-compat-ioctl32.c b/drivers/media/video/v4l2-compat-ioctl32.c
index af4419e..e6f67aa 100644
--- a/drivers/media/video/v4l2-compat-ioctl32.c
+++ b/drivers/media/video/v4l2-compat-ioctl32.c
@@ -1005,6 +1005,8 @@
 	case VIDIOC_G_ENC_INDEX:
 	case VIDIOC_ENCODER_CMD:
 	case VIDIOC_TRY_ENCODER_CMD:
+	case VIDIOC_DECODER_CMD:
+	case VIDIOC_TRY_DECODER_CMD:
 	case VIDIOC_DBG_S_REGISTER:
 	case VIDIOC_DBG_G_REGISTER:
 	case VIDIOC_DBG_G_CHIP_IDENT: