Those two experimental APIs never worked fine nor, afaik, were 
implemented at the apps. Their functionalities were implemented by other 
means.
So, let's remove those obsolete stuff.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>