staging: vt6656: rxtx remove rate change and current_rate.

There is no longer any need to change power in vnt_tx_packet.

Remove current_rate in vnt_tx_packet and struct vnt_private as
it is no longer used elsewhere.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/3ba896aa-5ab2-affb-9ce5-7df8a9b3190a@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>