[PATCH] ipw2200: rf kill switch polling power saving

Make the ipw2200 driver polling of rf kill switch occur on second boundaries to reduce
power. Making all the wakeup's in the system occur together reduces power, and keeps
CPU in idle longer.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>