staging: vt6655: s_cbFillTxBufHead remove unused parameters

Remove the following parameters
PSEthernetHeader psEthHeader
PSKeyItem pTransmitKey
bool bNeedEncrypt

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