ASoC: Factor out shared code from WM8993

The WM8993 analogue control is shared with other devices in the same
product line.  Since this is a very substantial proportion of the
driver move the definitions of these controls into a new wm_hubs module
which allows them to be shared between the two.

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/wm8993.c
Simple merge

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

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