staging: unisys: visorbus: remove invalid comment, we are one driver.

Removed a comment that was describing the relationship between the
visorchipset driver and the visorbus driver. Since they are now one
driver the comment no longer makes sense.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>