staging: vt6656: rename PIPEnsControlIn/CONTROLnsRequestIn with vnt_control_in

Replace all to CONTROLnsRequestIn with vnt_control_in and remove macro.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>