iwlwifi: style fixes to usage of << and >> operators

The << and >> operators need space on each side.

Cc: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>