[media] tw686x-kh: add audio support to the TODO list

The mainline tw686x driver also supports audio, that's missing here
as well.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/staging/media/tw686x-kh/TODO

-TODO: implement V4L2_FIELD_INTERLACED* mode(s).
+TODO:
+
+- implement V4L2_FIELD_INTERLACED* mode(s).
+- add audio support
 
 Please Cc: patches to Krzysztof Halasa <khalasa@piap.pl>.