MAINTAINERS: wifi: mark ar5523 as orphan

Last activity from Pontus for this driver is from 2013 so mark the driver
orphan.

Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230724104547.3061709-5-kvalo@kernel.org

Author: Kalle Valo

MAINTAINERS

@@ -21884,9 +21884,8 @@ S:	Maintained
 F:	drivers/usb/misc/apple-mfi-fastcharge.c
 
 USB AR5523 WIRELESS DRIVER
-M:	Pontus Fuchs <pontus.fuchs@gmail.com>
 L:	linux-wireless@vger.kernel.org
-S:	Maintained
+S:	Orphan
 F:	drivers/net/wireless/ath/ar5523/
 
 USB ATTACHED SCSI