regulator: max8925: update dt regulator binding doc

remove linux specific references, enumerates all supported
regulators
Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

Documentation/devicetree/bindings/regulator/max8925-regulator.txt

 Max8925 Voltage regulators
 
-max8925 regulator device register is still handled by mfd_add_devices, not by
-of_xxx, so, it is not necessary to add compatible name. Also, those reg
-offset and id info is stored in mfd_cell(see max8925-core.c), as a result
-there is not private properties in dts.
-
-node's name should match with the definition in max8925_regulator_matches
-(see max8925-regulator.c)
-
+Required nodes:
+-nodes:
+  - SDV1 for SDV SDV1
+  - SDV2 for SDV SDV2
+  - SDV3 for SDV SDV3
+  - LDO1 for LDO LDO1
+  - LDO2 for LDO LDO2
+  - LDO3 for LDO LDO3
+  - LDO4 for LDO LDO4
+  - LDO5 for LDO LDO5
+  - LDO6 for LDO LDO6
+  - LDO7 for LDO LDO7
+  - LDO8 for LDO LDO8
+  - LDO9 for LDO LDO9
+  - LDO10 for LDO LDO10
+  - LDO11 for LDO LDO11
+  - LDO12 for LDO LDO12
+  - LDO13 for LDO LDO13
+  - LDO14 for LDO LDO14
+  - LDO15 for LDO LDO15
+  - LDO16 for LDO LDO16
+  - LDO17 for LDO LDO17
+  - LDO18 for LDO LDO18
+  - LDO19 for LDO LDO19
+  - LDO20 for LDO LDO20
 
 Optional properties:
 - Any optional property defined in bindings/regulator/regulator.txt
 
-
 Example:
 
-
-	regulators {
 	SDV1 {
 		regulator-min-microvolt = <637500>;
 		regulator-max-microvolt = <1425000>;
@@ -24,6 +38,3 @@ Example:
 		regulator-always-on;
 	};
 
-		...
-		...
-	}