staging: vt6656: camel case clean up CARDvCalculateOFDMRParameter

Camel case changes
wRate -> rate
byBBType -> bb_type
pbyTxRate -> tx_rate
pbyRsvTime -> rsv_time

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