MAINTAINERS: Add entry for Cirrus CODEC drivers

I noticed that some recent patches hadn't been CCed to the Cirrus people
- add an entry in MAINTAINERS to help make that happen.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Acked-by: Paul Handrigan <Paul.Handrigan@cirrus.com>

MAINTAINERS

@@ -2200,6 +2200,13 @@ L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
 S:	Odd Fixes
 F:	sound/soc/codecs/cs4270*
 
+CIRRUS LOGIC AUDIO CODEC DRIVERS
+M:	Brian Austin <brian.austin@cirrus.com>
+M:	Paul Handrigan <Paul.Handrigan@cirrus.com>
+L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
+S:	Maintained
+F:	sound/soc/codecs/cs*
+
 CLEANCACHE API
 M:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 L:	linux-kernel@vger.kernel.org