It adds ASoC driver for AUD96P22 stereo audio codec integrated on ZTE
ZX family SoCs.  The driver includes the support for a number of volume
and mute controls, and power bits for various playback and recording
components.

Due to that the board for testing only supports playback, recording
support is untested.
Signed-off-by: NBaoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>