ASoC: rk3308_codec: add property 'rockchip,no-deep-low-power'

Change-Id: I22424e3f5198188c8ff1966894ea10ff1f00ab0f
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>

Author: acgzx

Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.txt

@@ -39,6 +39,8 @@ Optional properties:
   - rockchip,adc-grps-route = <3 0 2 1>;
 
 - rockchip,loopback-grp: It points out the ADC group which is the loopback used.
+- rockchip,no-deep-low-power: The codec will not enter deep low power mode
+  during suspend.
 - hp-ctl-gpios: The gpio of head phone controller.
 - spk-ctl-gpios: The gpio of speak controller.