mfd: madera: Update DT bindings to add additional CODECs

This adds the cs47l15, cs42l92, cs47l92 and cs47l93 to the list of
compatible strings and updates some properties that need to note
the new CODECs.

Signed-off-by: Richard Fitzgerald <[e-mail]>
Signed-off-by: Charles Keepax <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

Documentation/devicetree/bindings/mfd/madera.txt

···
 Required properties:
 
   - compatible : One of the following chip-specific strings:
+        "cirrus,cs47l15"
         "cirrus,cs47l35"
         "cirrus,cs47l85"
         "cirrus,cs47l90"
         "cirrus,cs47l91"
+        "cirrus,cs42l92"
+        "cirrus,cs47l92"
+        "cirrus,cs47l93"
         "cirrus,wm1840"
 
   - reg : I2C slave address when connected using I2C, chip select number when
···
 
   - DCVDD-supply : Power supply for the device as defined in
     bindings/regulator/regulator.txt
-    Mandatory on CS47L35, CS47L90, CS47L91
+    Mandatory on CS47L15, CS47L35, CS47L90, CS47L91, CS42L92, CS47L92, CS47L93
     Optional on CS47L85, WM1840
 
   - AVDD-supply, DBVDD1-supply, DBVDD2-supply, CPVDD1-supply, CPVDD2-supply :
···
     (CS47L85, WM1840)
 
   - SPKVDD-supply : Power supply for the device
-    (CS47L35)
+    (CS47L15, CS47L35)
 
   - interrupt-controller : Indicates that this device is an interrupt controller