MAINTAINERS: wifi: remove Kalle

I'm stepping down as wireless driver maintainer. Johannes kindly voluntereed to
be the "custodian"[1] for the drivers until a better solution is found.

Link: https://lore.kernel.org/all/21896d2788b8bc6c7fcb534cd43e75671a57f494.camel@sipsolutions.net/ [1]
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20250203180445.1429640-2-kvalo@kernel.org

Author: Kalle Valo

MAINTAINERS

@@ -16341,7 +16341,7 @@ X:	drivers/net/can/
 X:	drivers/net/wireless/
 
 NETWORKING DRIVERS (WIRELESS)
-M:	Kalle Valo <kvalo@kernel.org>
+M:	Johannes Berg <johannes@sipsolutions.net>
 L:	linux-wireless@vger.kernel.org
 S:	Maintained
 W:	https://wireless.wiki.kernel.org/