ASoC: zx_aud96p22: add ZTE ZX AUD96P22 codec driver

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: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -1114,6 +1114,11 @@ config SND_SOC_WM9713
 	tristate
 	select REGMAP_AC97
 
+config SND_SOC_ZX_AUD96P22
+	tristate "ZTE ZX AUD96P22 CODEC"
+	depends on I2C
+	select REGMAP_I2C
+
 # Amp
 config SND_SOC_LM4857
 	tristate

sound/soc/codecs/Makefile

@@ -224,6 +224,7 @@ snd-soc-wm9705-objs := wm9705.o
 snd-soc-wm9712-objs := wm9712.o
 snd-soc-wm9713-objs := wm9713.o
 snd-soc-wm-hubs-objs := wm_hubs.o
+snd-soc-zx-aud96p22-objs := zx_aud96p22.o
 # Amp
 snd-soc-dio2125-objs := dio2125.o
 snd-soc-max9877-objs := max9877.o
@@ -455,6 +456,7 @@ obj-$(CONFIG_SND_SOC_WM9712)	+= snd-soc-wm9712.o
 obj-$(CONFIG_SND_SOC_WM9713)	+= snd-soc-wm9713.o
 obj-$(CONFIG_SND_SOC_WM_ADSP)	+= snd-soc-wm-adsp.o
 obj-$(CONFIG_SND_SOC_WM_HUBS)	+= snd-soc-wm-hubs.o
+obj-$(CONFIG_SND_SOC_ZX_AUD96P22) += snd-soc-zx-aud96p22.o
 
 # Amp
 obj-$(CONFIG_SND_SOC_DIO2125)	+= snd-soc-dio2125.o