staging: vt6656: rxtx.c: s_vFillTxKey Replace dwRevIVCounter

Fix base type to __le32 and remove camel case.

Camel case change
dwRevIVCounter -> rev_iv_counter

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