iwlwifi: remove FSF's address from the license notice

The Free Software Foundation's address shouldn't be in the license
notice anymore, and some of our check scripts complain about it
(via checkpatch.pl).  Remove the address to silence it.

Signed-off-by: Golan Ben Ami <golan.ben.ami@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>