ASoC: Convert WM2000 into a standard CODEC driver

We've been able to handle external amps for a while now.

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/wm2000.c
Simple merge

diff --cc sound/soc/codecs/wm2000.h
Simple merge