ASoC: Add abbreviation to maintainers for searchability

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 16202c8..0c71569 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3907,7 +3907,7 @@
 L:	alsa-devel@alsa-project.org (subscribers-only)
 S:	Maintained
 
-SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT
+SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT (ASoC)
 P:	Liam Girdwood
 M:	lrg@slimlogic.co.uk
 P:	Mark Brown