ASoC: Add abbreviation to maintainers for searchability

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

MAINTAINERS

@@ -3907,7 +3907,7 @@ M:	tiwai@suse.de
 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