new ad1836 codec driver based on asoc

There has been an ad1836 driver in sound/blackfin based on traditional alsa.
The new driver is based on asoc. The architecture of ad1836 codec driver is
very much like ad1938.

Signed-off-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --cc sound/soc/codecs/Kconfig
Simple merge

diff --cc sound/soc/codecs/Makefile
Simple merge

diff --cc sound/soc/codecs/ad1836.c
Simple merge

diff --cc sound/soc/codecs/ad1836.h
Simple merge