staging: vt6656: change bssdb/rxtx/wpa2 to new structures

Use
struct vnt_private
struct vnt_manager

Move vnt_manager from sMgmtObj to vnt_mgmt.

This patch cleans up function declarations, definitions and local variables
where appropriate replacing types defined in "type.h" with linux/types.h.

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