staging: vt6656: remove rate_control_algorithm pid

rate control algorithm pid was removed from wireless tree

The device defaults to algorithm 'minstrel_ht'

There has been no problems using this algorithm.

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