mfd: arizona: Update DT bindings to add CS47L24 and WM1831

This updates the Arizona MFD device tree bindings to add the
Cirrus Logic CS47L24 and WM1831 codecs. Note that unlike all the
other codecs the DCVDD-supply and MICVDD-supply are mandatory.
Signed-off-by: NRichard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/arizona.txt

-Wolfson Arizona class audio SoCs
+Cirrus Logic/Wolfson Microelectronics Arizona class audio SoCs
 
 These devices are audio SoCs with extensive digital capabilites and a range
 of analogue I/O.
@@ -6,12 +6,14 @@ of analogue I/O.
 Required properties:
 
   - compatible : One of the following chip-specific strings:
+        "cirrus,cs47l24"
         "wlf,wm5102"
         "wlf,wm5110"
         "wlf,wm8280"
         "wlf,wm8997"
         "wlf,wm8998"
         "wlf,wm1814"
+        "wlf,wm1831"
 
   - reg : I2C slave address when connected using I2C, chip select number when
     using SPI.
@@ -41,6 +43,10 @@ Required properties:
 
   - SPKVDD-supply : Speaker driver power supply (wm8997)
 
+  - DCVDD-supply : Main power supply (cs47l24, wm1831)
+
+  - MICVDD-supply : Microphone power supply (cs47l24, wm1831)
+
 Optional properties:
 
   - wlf,reset : GPIO specifier for the GPIO controlling /RESET
@@ -69,6 +75,7 @@ Optional properties:
   - DCVDD-supply, MICVDD-supply : Power supplies, only need to be specified if
     they are being externally supplied. As covered in
     Documentation/devicetree/bindings/regulator/regulator.txt
+    (wm5102, wm5110, wm8280, wm8997, wm8998, wm1814)
 
 Also see child specific device properties:
   Regulator - ../regulator/arizona-regulator.txt