staging: vt6656: struct vnt_private remove camel case antenna variables

Camel case changes
bTxRxAntInv -> tx_rx_ant_inv
dwRxAntennaSel -> rx_antenna_sel
byRxAntennaMode -> rx_antenna_mode
byTxAntennaMode -> tx_antenna_mode
byRadioCtl -> radio_ctl

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