staging: vc04_services: Remove unused functions

These four functions are not used and report errors with sparse.

Signed-off-by: Jean-Baptiste Abbadie <jb@abbadie.fr>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>