staging: ks7010: add task to TODO file

Driver uses custom Michael MIC implementation. There is already an
implementation within the kernel. There is at least one other driver
already using the kernel implementation
(drivers/net/wireless/intersil/orinoco).

Add task to TODO file.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>