MAINTAINERS: Add maintainer for iwlwifi

Add Johannes Berg as the primary maintainer for iwlwifi driver
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -3592,6 +3592,7 @@ S:	Supported
 F:	drivers/net/wireless/iwlegacy/
 
 INTEL WIRELESS WIFI LINK (iwlwifi)
+M:	Johannes Berg <johannes.berg@intel.com>
 M:	Wey-Yi Guy <wey-yi.w.guy@intel.com>
 M:	Intel Linux Wireless <ilw@linux.intel.com>
 L:	linux-wireless@vger.kernel.org