1. delete redundant assignment to bus field in spi_driver structure
2. fix lost assignment to set_bias_level entry in ad1938 codec dai
3. change spi driver name of ad1836 from "ad1836-spi" to "ad1836"
Signed-off-by: NBarry Song <barry.song@analog.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Remove unused #include <linux/version.h>('s) in
  sound/soc/codecs/ad1836.c
  sound/soc/codecs/ad1938.c
  sound/soc/codecs/wm8974.c
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

- Build in SND_SOC_ALL_CODECS.
- Remove null suspend/resume stuff.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

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