MAINTAINERS: remove myself as iwlwifi driver maintainer

As I'm resigning from Intel, it's time to remove myself as a maintainer
of iwlwifi. Good luck to Miri!

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240102122019.1689602-1-gregory.greenman@intel.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>