MAINTAINERS: Update email address for patches to Wolfson parts

A somewhat overdue update of the address for sending patches on Wolfson
parts to since our acquision a couple of years ago by Cirrus Logic.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index f7d568b..517829e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13858,7 +13858,7 @@
 F:	drivers/net/wireless/wl3501*
 
 WOLFSON MICROELECTRONICS DRIVERS
-L:	patches@opensource.wolfsonmicro.com
+L:	patches@opensource.cirrus.com
 T:	git https://github.com/CirrusLogic/linux-drivers.git
 W:	https://github.com/CirrusLogic/linux-drivers/wiki
 S:	Supported