iwlwifi: fix resume while txpower off

This patch take care of coming out rfkill when the driver is up while
rfkill is on by restarting interface.

Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>