iwlwifi: update MAINTAINERS entry

Reflect the fact that the linuxwifi@intel.com address will disappear,
and that neither Emmanuel nor myself are really much involved with
the maintenance these days.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20201129151117.a25afe6d2c7f.I8f13a5689dd353825fb2b9bd5b6f0fbce92cb12b@changeid

MAINTAINERS

@@ -9097,10 +9097,7 @@ S:	Supported
 F:	drivers/net/wireless/intel/iwlegacy/
 
 INTEL WIRELESS WIFI LINK (iwlwifi)
-M:	Johannes Berg <johannes.berg@intel.com>
-M:	Emmanuel Grumbach <emmanuel.grumbach@intel.com>
 M:	Luca Coelho <luciano.coelho@intel.com>
-M:	Intel Linux Wireless <linuxwifi@intel.com>
 L:	linux-wireless@vger.kernel.org
 S:	Supported
 W:	https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi