MAINTAINERS: claim include/uapi/linux/wireless.h

As much as I don't really want to maintain this legacy
cruft that we started replacing 15+ years ago, for now
it still falls on me to take care of it. Add a missing
file to the list.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220328114029.526fbb42784d.If7c79b4ca827dfe82a545689f2d31fcedabd8387@changeid