[ALSA] ASoC: documentation & maintainer

This patch adds documentation describing the ASoC architecture and a
maintainer entry for ASoC.
The documentation includes the following files:-
codec.txt: Codec driver internals.
DAI.txt: Description of Digital Audio Interface standards and how to
configure a DAI within your codec and CPU DAI drivers.
dapm.txt: Dynamic Audio Power Management.
platform.txt: Platform audio DMA and DAI.
machine.txt: Machine driver internals.
pop_clicks.txt: How to minimise audio artifacts.
clocking.txt: ASoC clocking for best power performance.

Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/MAINTAINERS b/MAINTAINERS
index fe35f3a..010658a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3037,6 +3037,12 @@
 L:	alsa-devel@alsa-project.org
 S:	Maintained
 
+SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT
+P:	Liam Girdwood
+M:	liam.girdwood@wolfsonmicro.com
+L:	alsa-devel@alsa-project.org
+S:	Supported
+
 SPI SUBSYSTEM
 P:	David Brownell
 M:	dbrownell@users.sourceforge.net