staging: vt6656: staging: vt6656 change remaining to vnt_mgmt and remove typedef.

Use
struct vnt_manager

Move vnt_manager from sMgmtObj to vnt_mgmt.

and remove typedef from structures
vnt_private
vnt_manager
vnt_rx_mgmt
vnt_tx_mgmt

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