staging: vt6656: rxtx Replace wTimeStampOff* variables

Fix base type to __le16 and remove camel case.

Camel case changes
wTimeStampOff* -> time_stamp_off*

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