MAINTAINERS: add common wireless and wireless-next trees

MAINTAINERS: add common wireless and wireless-next trees

For easier maintenance we have decided to create common wireless and
wireless-next trees for all wireless patches. Old mac80211 and wireless-drivers
trees will not be used anymore.

While at it, add a wiki link to wireless drivers section and a patchwork link
to 802.11, mac80211 and rfkill sections. Also use https in patchwork links.

Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220117181958.3509-1-kvalo@kernel.org