MAINTAINERS: Switch maintenance for mcr20a driver over

Xue Liu has not been actively working on the driver or reviewing
patches for several years. I have been taking odd fixes in through the
wpan/ieee802154 tree. Update the MAINTAINERS file to reflect this
reality. I wanted to thank Xue Liu for his work on the driver.
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Link: https://lore.kernel.org/r/20230218211317.284889-2-stefan@datenfreihafen.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -12822,9 +12822,9 @@ F:	drivers/iio/potentiometer/mcp4018.c
 F:	drivers/iio/potentiometer/mcp4531.c
 
 MCR20A IEEE-802.15.4 RADIO DRIVER
-M:	Xue Liu <liuxuenetmail@gmail.com>
+M:	Stefan Schmidt <stefan@datenfreihafen.org>
 L:	linux-wpan@vger.kernel.org
-S:	Maintained
+S:	Odd Fixes
 W:	https://github.com/xueliu/mcr20a-linux
 F:	Documentation/devicetree/bindings/net/ieee802154/mcr20a.txt
 F:	drivers/net/ieee802154/mcr20a.c