staging: vt6656: rxtx s_vFillTxKey Fix pdwIV base type

Use base type __le32 and endian correct changed values.

Correct endian conversions to cpu_to_le32.

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