staging: vt6656: camel case clean up CARDvUpdateNextTBTT

camel case changes
pDevice -> priv
qwTSF -> tsf
wBeaconInterval -> beacon_interval
pbyData -> data

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