ASoC: cs42l51: split i2c from codec driver

This patch removes the i2c bus code from the codec driver and creates seperate i2c driver.

Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

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

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

diff --cc sound/soc/codecs/cs42l51-i2c.c
Simple merge

diff --cc sound/soc/codecs/cs42l51.c
Simple merge

diff --cc sound/soc/codecs/cs42l51.h
Simple merge